阅读说明：本技术 一种气/液体光谱偏振二向反射模型特性测试装置及方法 (Gas/liquid spectral polarization two-way reflection model characteristic testing device and method ) 是由 付强 范新宇 段锦 刘建华 战俊彤 张肃 王莉雅 姜会林 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种气/液体光谱偏振二向反射模型特性测试装置及方法,属于偏振光散射特性测量分析和光电成像技术领域,装置包括方形密闭箱、发射系统、后向散射接收系统、前向透射接收系统、检测系统、数据处理系统、电机控制系统和样品充排装置；可以在室内将气体充入方形密闭箱中模拟室外的环境,在不同天顶角和方位角下对气体前向透射和后向散射偏振光传输特性的测量,可根据需要设置气体的不同温湿度、不同压强,对高空中或矿下气体的模拟,也可根据实验装置测量结果建立不同气体不同温湿度不同压强下的BRDF数据库。亦可将海水充入方形密闭箱中模拟模拟一定压强或温湿度条件下海洋环境,通过测量液体的BRDF,可以掌握海面的偏振特性。(The invention discloses a device and a method for testing the characteristics of a gas/liquid spectrum polarization bidirectional reflection model, belonging to the technical field of polarized light scattering characteristic measurement analysis and photoelectric imaging, wherein the device comprises a square closed box, an emission system, a backward scattering receiving system, a forward transmission receiving system, a detection system, a data processing system, a motor control system and a sample charging and discharging device; the device can be used for simulating outdoor environment by filling gas into a square closed box indoors, measuring the forward transmission and backward scattering polarized light transmission characteristics of the gas at different zenith angles and azimuth angles, setting different humiture and different pressure intensities of the gas as required, simulating the gas in high altitude or in mines, and establishing a BRDF database of different gases at different humiture and different pressure intensities according to the measurement result of an experimental device. Sea water can also be filled into the square closed box to simulate the marine environment under certain pressure or temperature and humidity conditions, and the polarization characteristics of the sea surface can be mastered by measuring the BRDF of the liquid.)

1. A gas/liquid spectral polarization two-way reflection model characteristic testing device is characterized by comprising: the device comprises a square closed box (1), an emission system (2), a back scattering receiving system (3), a forward transmission receiving system (4), a detection system (5), a data processing system (6), a motor control system (7) and a sample charging and discharging device (8);

the square airtight box (1) is internally used for filling gas or liquid samples, the top of the square airtight box (1) is provided with an optical window (11) and a sample inlet and outlet I (12), the bottom of the square airtight box (1) is provided with a sample inlet and outlet II (13), the square airtight box (1) is internally provided with a 360-degree double-track slide rail (15), a 90-degree guide rail I (16), a 90-degree guide rail II (17), a 90-degree guide rail III (18) and a 90-degree guide rail I (16), the 90-degree guide rail II (17) and the 90-degree guide rail III (18) are both 90-degree arc guide rails, a 360-degree double-track slide rail (15) is horizontally arranged in the middle of the square closed box (1), the circle centers corresponding to the 360-degree double-track slide rail (15), the 90-degree guide rail I (16), the 90-degree guide rail II (17) and the 90-degree guide rail III (18) intersect at the same point, and the point is superposed with the center of the square closed box (1); degrees are marked on a 360-degree double-track sliding rail (15), a 90-degree guide rail I (16), a 90-degree guide rail II (17) and a 90-degree guide rail III (18); one end of each of the 90-degree guide rail I (16), the 90-degree guide rail II (17) and the 90-degree guide rail III (18) is connected with a steering engine, the three steering engines are connected with the motor control system (7) through buses, and the other ends of the 90-degree guide rail I (16), the 90-degree guide rail II (17) and the 90-degree guide rail III (18) are connected with the 360-degree double-track slide rail (15) in a sliding fit manner;

the emitting system (2) is arranged on a 90-degree guide rail I (16) and can be driven by a driving motor to move relative to the 90-degree guide rail I (16), the emitting system (2) comprises an infrared laser (21), a beam splitter prism (22), a polarizer (23), an 1/4 glass slide (24), a beam expander (25) and an optical power meter (26), the infrared laser (21), the beam splitter prism (22), the polarizer (23), the 1/4 glass sheet (24) and the beam expander (25) share the same optical axis, the beam splitter prism (22) is used for splitting the light emitted by the infrared laser (21) into two beams with the same energy, one beam is used as measuring light, the measuring light is emitted through the polarizer (23), the 1/4 glass sheet (24) and the beam expander (25) in sequence and then irradiated onto the forward transmission receiving system (4), and the other beam is used as reference light and irradiated onto a probe of the optical power meter (26);

the backscatter receiving system (3) is installed on a 90-degree guide rail II (17) and can be driven by a driving motor to move relative to the 90-degree guide rail II (17), the backscatter receiving system (3) comprises a convex lens I (31), a spectrum polarization camera I (32), a long-wave infrared camera I (33) and a convex lens II (34), the spectrum polarization camera I (32) and the long-wave infrared camera I (33) are electrically connected with the data processing system (6), the distance between the convex lens I (31) and the spectrum polarization camera I (32) is one lens focal length, and the distance between the convex lens II (34) and the long-wave infrared camera I (33) is one lens focal length;

the forward transmission receiving system (4) is installed on a 90-degree guide rail III (18) and can be driven by a driving motor to move relative to the 90-degree guide rail III (18), the forward transmission receiving system (4) and the transmitting system (2) are always kept right opposite, the forward transmission receiving system (4) comprises a convex lens III (41), a spectrum polarization camera II (42), a long-wave infrared camera II (43) and a convex lens IV (44), the spectrum polarization camera II (42) and the long-wave infrared camera II (43) are electrically connected with the data processing system (6), the convex lens III (41) is a lens focal length away from the spectrum polarization camera II (42), and the convex lens IV (44) is a lens focal length away from the long-wave infrared camera II (43);

the detection system (5) comprises a pressure sensor (51), a humidity sensor (52), a temperature sensor (53), a heating rod (54), an air pressure tank (55) and a pressure and temperature and humidity display (56), wherein the pressure sensor (51), the humidity sensor (52), the temperature sensor (53) and the heating rod (54) are positioned on the inner wall of the square airtight box (1), and the pressure sensor (51), the humidity sensor (52) and the temperature sensor (53) are electrically connected with the pressure and temperature and humidity display (56) positioned outside the square airtight box (1); the air pressure tank (55) is positioned outside the square closed box (1), and the air pressure tank (55) is communicated with the inside of the square closed box (1) and used for regulating and controlling the air pressure inside the square closed box (1);

the data processing system (6) comprises a computer (61) which is used for acquiring data and images of the back scattering receiving system (3) and the forward transmission receiving system (4) and storing the data;

the motor control system (7) is respectively electrically connected with a driving motor for driving the emission system (2), the back scattering receiving system (3) and the forward transmission receiving system (4) to move;

the sample charging and discharging device (8) is connected with the square closed box (1) through a guide pipe (82), and a valve (81) is arranged at the joint of the guide pipe (82) and the square closed box (1).

2. The apparatus for testing characteristics of a gas/liquid spectral polarization bi-directional reflection model according to claim 1, wherein: the launching system (2) is arranged on a 90-degree guide rail I (16) through an iron plate, a driving motor with a driving wheel is arranged at the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail I (16), the driving motor is connected with a motor control system (7), and the driving motor drives the launching system (2) to move relative to the 90-degree guide rail I (16) through the control of the motor control system (7).

3. The apparatus for testing characteristics of a gas/liquid spectral polarization bi-directional reflection model according to claim 1, wherein: the backscatter receiving system (3) is arranged on a 90-degree guide rail II (17) through an iron plate, a driving motor with a driving wheel is arranged at the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail II (17), the driving motor is connected with a motor control system (7), and the driving motor drives the backscatter receiving system (3) to move relative to the 90-degree guide rail II (17) under the control of the motor control system (7).

4. The apparatus for testing characteristics of a gas/liquid spectral polarization bi-directional reflection model according to claim 1, wherein: the forward transmission receiving system (4) is arranged on a 90-degree guide rail III (18) through an iron plate, a driving motor with a driving wheel is arranged at the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail III (18), the driving motor is connected with a motor control system (7), and the driving motor drives the forward transmission receiving system (4) to move relative to the 90-degree guide rail III (18) under the control of the motor control system (7).

5. A method for testing characteristics of a gas/liquid spectral polarization bidirectional reflection model, which is based on the device for testing characteristics of a gas/liquid spectral polarization bidirectional reflection model of claim 1, 2, 3 or 4, and specifically comprises the following steps:

step one, preparing an experimental environment

Cleaning devices in the square closed box (1), measuring and adjusting the temperature, humidity and pressure in the square closed box (1) to meet required experimental conditions, fixing each experimental device, calibrating the zero position of a 360-degree double-rail sliding rail (15), and keeping the dark environment in the square closed box (1);

step two, changing the emergent zenith angle

An optical window (11) of the square closed box (1) is closed, a gas or liquid sample to be measured is filled into the square closed box (1) through a guide pipe (82), an air valve (81) is arranged on the guide pipe (82), and the emission system (2) and the 90-degree guide rail I (16) are kept motionless; the forward transmission receiving system (4) and the transmitting system (2) are always kept right opposite, an initial value is set to be 0 degrees, a driving motor corresponding to the backward scattering receiving system (3) is controlled through a motor control system (7), the driving motor drives the backward scattering receiving system (3) to move on a 90-degree guide rail II (17), so that an emergent zenith angle is changed, and a computer (61) records data of the backward scattering receiving system (3) and the forward transmission receiving system (4) and shoots an infrared image for storage;

step three, changing the emergent azimuth angle

Keeping the emission system (2) and the 90-degree guide rail I (16) stationary, and when a gas or liquid sample is relatively stable, controlling a steering engine connected with the 90-degree guide rail II (17) through a motor control system (7) to enable the 90-degree guide rail II (17) to rotate along a 360-degree double-track slide rail (15) to change an emergent azimuth angle, and recording sample scattering spectra measured by the backscattering receiving system (3) and the forward transmission receiving system (4) and shooting an infrared image for storage through a computer (61);

step four, changing the incident zenith angle

Controlling a driving motor corresponding to the transmitting system (2) through a motor control system (7), changing the position of the infrared laser (21) to change the incident zenith angle, controlling a driving motor corresponding to the forward transmission receiving system (4) through the motor control system (7), driving the forward transmission receiving system (4) to move, measuring transmitted light, and repeatedly performing the second step and the third step;

step five, changing the incident azimuth angle

Controlling a steering engine corresponding to the 90-degree guide rail I (16) through a motor control system (7), enabling the 90-degree guide rail I (16) to rotate for 360 degrees along a 360-degree double-track slide rail (15), enabling an incident azimuth angle to change, and repeatedly performing the second step to the fourth step;

sixthly, calculating BRDF data of gas or liquid sample under normal temperature environment

Placing the polytetrafluoroethylene standard plate into a square closed box (1), repeating the steps from the first step to the fifth step, and calculating by using a comparison method through a data processing system (6) to obtain a BRDF (bidirectional reflectance distribution function) value and a corresponding image;

step seven, measuring BRDF data of gas or liquid samples at different temperatures

Heating the filled gas or liquid sample in the square closed box (1) through a heating rod (54), detecting the temperature in the box in real time through a temperature sensor (53), displaying the temperature on a pressure and temperature and humidity display (56), and repeating the second step to the fifth step after the gas or liquid sample is stabilized; the experiment was repeated with varying temperatures; the data processing system (6) calculates and obtains BRDF values and corresponding images of the samples at different temperatures, and stores the BRDF values and the corresponding images in a file form;

step eight, measuring BRDF data of gas under different pressures

Changing the pressure in the box body of the square closed box (1) through an air pressure tank (55), monitoring the pressure in the box in real time through a pressure sensor (51), displaying the pressure at the moment through a pressure temperature and humidity display (56), and repeating the steps from two to five after the sample is stabilized; the experiment was repeated with varying pressure; the data processing system (6) calculates BRDF values and corresponding images of the gas or liquid samples under different pressures and stores the BRDF values and the corresponding images in a file form;

step nine, changing the direction angle of the polaroid

Opening the infrared laser (21), and sequentially adjusting the direction angles of the rotating polarizer (23) to 45 degrees, 90 degrees and 135 degrees to obtain corresponding linearly polarized light; then 1/4 wave plate (24) is added, and the direction angle of the polarizer (23) is rotated to be adjusted to 45 degrees and 135 degrees in sequence to obtain corresponding circularly polarized light;

step ten, finishing the measurement experiment

And (3) closing the emission system (2), the backscattering receiving system (3), the forward transmission receiving system (4), the detection system (5), the data processing system (6) and the motor control system (7), adjusting the pressure in the square airtight box (1) and emptying the sample in the box to finish the experiment.

6. The method for testing the characteristics of the gas/liquid spectral polarization dichroic reflection model according to claim 5, wherein: in the sixth step, the process of calculating the BRDF value and the corresponding image of the gas or liquid by the data processing system (6) by using a contrast method is as follows:

the data processing system (6) is used for processing the gas scattering spectrum L of the hemispherical reflectivity rho/pi of the bidirectional reflection distribution function of the polytetrafluoroethylene standard plate_SAnd standard plate scattering spectrum L_bSubstituting the following equation:

wherein f is_r,s(θ_i,φ_i,θ_r,φ_rλ) is the target two-way reflection distribution function, θ_iIs the incident zenith angle, phi, of the measured object_iAt an angle of incidence of the measured object, theta_rIs the emergent zenith angle phi of the measured target_rLambda is the incident light wavelength theta 'is the exit azimuth angle of the measured target'_iIs the incident zenith angle phi of the measured standard plate'_iIs the incident azimuth angle, theta 'of the measured standard plate'_rIs the emergent zenith angle phi of the measured standard plate'_rIs the emergent azimuth angle of the measured standard plate.

Technical Field

The invention belongs to the technical field of polarized light scattering characteristic measurement and analysis and photoelectric imaging, and particularly relates to a device and a method for testing characteristics of a gas/liquid spectral polarization two-way reflection model.

Background

In modern society life and production, as the degree of industrialization is continuously increased, pressure vessels, pipelines and the like for storing and delivering compressed gas are widely used, and airtightness is one of important indexes of quality and safety of the equipment. The gas leakage and other problems can be caused due to poor air tightness, the traditional ultrasonic sound intensity detection method can not be used for judging the weak sound intensity generated by micro leakage, the characteristics of the gas can be mastered by measuring the two-way reflection distribution function of the gas, and the infrared imaging technology can be used for effectively monitoring more than 50 common chemical gases such as alkanes, alkenes, aldehydes, ketones, benzenes, ammonia, sulfides and the like. In the marine environment, many plants discharge untreated wastewater into the sea, causing water pollution, the contrast in reflectivity between pure and polluted surfaces is different. By measuring the two-way reflection distribution function of the liquid, the polarization characteristic of the liquid surface can be grasped. The institute of optical precision machinery of Anhui of Chinese academy of sciences invented a BRDF (Water mist) measuring method in laboratories, see the publication No. CN1858579A of Chinese patent document, but it is unable to monitor the temperature, humidity and pressure in the device in real time, and does not consider the density of gas, and can only measure two special liquids. The university of Changchun's science and engineering invented a simulation device for the measurement of the sea surface target pBRDF and its use method, see the Chinese patent document publication No. CN113176184A for details, but the device can only measure the sea surface target, but cannot measure the BRDF of the gas. The institute of optical precision machinery of Anhui of Chinese academy of sciences invented an indoor full-automatic BRDF measuring device, see the Chinese patent document publication No. CN10232324013, but it can not measure gas and liquid, and can not measure pressure, temperature and humidity in real time. Therefore, there is a need in the art for a new indoor analog measurement device to solve these problems.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the device and the method are characterized in that a gas or liquid sample to be tested is filled into a square closed box, the forward transmission light intensity and the backward scattering light intensity transmission characteristics of the gas or liquid sample at different zenith angles and azimuth angles are measured under the condition of simulating certain pressure intensity or temperature and humidity, and theoretical basis and real data support are provided for selection and numerical simulation of a polarization BRDF model of real high-altitude, mine or gas leakage environment and real sea surface liquid.

The invention provides a device for testing the characteristics of a gas/liquid spectral polarization two-way reflection model, which is characterized by comprising the following components: the device comprises a square closed box, an emission system, a back scattering receiving system, a forward transmission receiving system, a detection system, a data processing system, a motor control system and a sample charging and discharging device;

the square airtight box is internally filled with a gas or liquid sample, the top of the square airtight box is provided with an optical window and a sample inlet and outlet I, the bottom of the square airtight box is provided with a sample inlet and outlet II, the square airtight box is internally provided with a 360-degree double-track sliding rail, a 90-degree guide rail I, a 90-degree guide rail II and a 90-degree guide rail III, the 90-degree guide rail I, the 90-degree guide rail II and the 90-degree guide rail III are all 90-degree arc guide rails, the 360-degree double-track sliding rail is horizontally arranged in the middle of the square airtight box, the circle centers corresponding to the 360-degree double-track sliding rail, the 90-degree guide rail I, the 90-degree guide rail II and the 90-degree guide rail III are intersected at the same point, and the point is overlapped with the center of the square airtight box; degrees are marked on the 360-degree double-track sliding rail, the 90-degree guide rail I, the 90-degree guide rail II and the 90-degree guide rail III; one end of each of the 90-degree guide rail I, the 90-degree guide rail II and the 90-degree guide rail III is connected with a steering engine, the three steering engines are connected with a motor control system through buses, and the other ends of the 90-degree guide rail I, the 90-degree guide rail II and the 90-degree guide rail III are connected with 360-degree double-track slide rails in a sliding fit manner;

the transmitting system is arranged on a 90-degree guide rail I and can be driven by a driving motor to move relative to the 90-degree guide rail I, the transmitting system comprises an infrared laser, a beam splitter prism, a polarizer, an 1/4 glass slide, a beam expander and an optical power meter, the infrared laser, the beam splitter prism, the polarizer, the 1/4 glass slide and the beam expander share a common optical axis, the beam splitter prism is used for splitting light emitted by the infrared laser into two beams with the same energy, one beam is used as measuring light and is emitted by the polarizer, the 1/4 glass slide and the beam expander in sequence and then irradiates a forward transmission receiving system, and the other beam is used as reference light and irradiates a probe of the optical power meter;

the backscattering receiving system is arranged on a 90-degree guide rail II and can be driven by a driving motor to move relative to the 90-degree guide rail II, the backscattering receiving system comprises a convex lens I, a spectrum polarization camera I, a long-wave infrared camera I and a convex lens II, the spectrum polarization camera I and the long-wave infrared camera I are electrically connected with the data processing system, the distance between the convex lens I and the spectrum polarization camera I is one lens focal length, and the distance between the convex lens II and the long-wave infrared camera I is one lens focal length;

the forward transmission receiving system is arranged on a 90-degree guide rail III and can be driven by a driving motor to move relative to the 90-degree guide rail III, the forward transmission receiving system and the transmitting system are always kept opposite, the forward transmission receiving system comprises a convex lens III, a spectrum polarization camera II, a long-wave infrared camera II and a convex lens IV, the spectrum polarization camera II and the long-wave infrared camera II are electrically connected with the data processing system, the convex lens III is at a lens focal length from the spectrum polarization camera II, and the convex lens IV is at a lens focal length from the long-wave infrared camera II;

the detection system comprises a pressure sensor, a humidity sensor, a temperature sensor, a heating rod, an air pressure tank and a pressure and temperature and humidity display, wherein the pressure sensor, the humidity sensor, the temperature sensor and the heating rod are positioned on the side wall of the square airtight box, and the pressure sensor, the humidity sensor and the temperature sensor are electrically connected with the pressure and temperature display positioned outside the square airtight box; the air pressure tank is positioned outside the square closed box and communicated with the inside of the square closed box and used for regulating and controlling the air pressure inside the square closed box;

the data processing system comprises a computer, a forward transmission receiving system and a back scattering receiving system, wherein the computer is used for acquiring data and images of the back scattering receiving system and the forward transmission receiving system and storing the data;

the motor control system is respectively electrically connected with a driving motor for driving the emission system, the back scattering receiving system and the forward transmission receiving system to move;

the sample filling and discharging device is connected with the square airtight box through a guide pipe, and a valve is arranged at the joint of the guide pipe and the square airtight box.

According to the specific embodiment of the invention, the launching system is arranged on the 90-degree guide rail I through an iron plate, a driving motor with a driving wheel is arranged in the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail I, the driving motor is connected with a motor control system, and the driving motor is controlled by the motor control system to drive the launching system to move relative to the 90-degree guide rail I.

According to the specific embodiment of the invention, the backscatter receiving system is mounted on a 90-degree guide rail II through an iron plate, a driving motor with a driving wheel is mounted at the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail II, the driving motor is connected with a motor control system, and the driving motor is controlled by the motor control system to drive the backscatter receiving system to move relative to the 90-degree guide rail II.

According to a specific embodiment of the invention, the forward transmission receiving system is mounted on a 90 ° guide rail iii through an iron plate, a driving motor with a driving wheel is mounted at the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90 ° guide rail iii, the driving motor is connected with a motor control system, and the driving motor is controlled by the motor control system to drive the forward transmission receiving system to move relative to the 90 ° guide rail iii.

The invention also provides a method for testing the characteristics of the gas/liquid spectral polarization bidirectional reflection model, which is characterized in that the method is based on the device for testing the characteristics of the gas/liquid spectral polarization bidirectional reflection model, and specifically comprises the following steps:

step one, preparing an experimental environment

Cleaning devices in the square airtight box, measuring and adjusting the temperature, humidity and pressure in the square airtight box to meet required experimental conditions, fixing each experimental device, calibrating zero positions of the 360-degree double-rail sliding rails, and keeping a dark environment in the square airtight box;

step two, changing the emergent zenith angle

Closing an optical window of the square closed box, filling a gas or liquid sample to be measured into the square closed box through a guide pipe, wherein an air valve is arranged on the guide pipe, and a transmitting system and the 90-degree guide rail I are kept motionless; the forward transmission receiving system and the transmitting system are always kept opposite, an initial value is set to be 0 degrees, a driving motor corresponding to the backward scattering receiving system is controlled through a motor control system, the driving motor drives the backward scattering receiving system to move on a 90-degree guide rail II, so that an emergent zenith angle is changed, and the computer records data of the backward scattering receiving system and the forward transmission receiving system and shoots an infrared image for storage;

step three, changing the emergent azimuth angle

Keeping the emission system and the 90-degree guide rail I still, and controlling a steering engine connected with the 90-degree guide rail II through a motor control system when a gas or liquid sample is relatively stable, so that the 90-degree guide rail II rotates along a 360-degree double-track slide rail, the emergent azimuth angle is changed, and the computer records the scattering spectrum of the sample measured by the backward scattering receiving system and the forward transmission receiving system and shoots an infrared image for storage;

step four, changing the incident zenith angle

Controlling a driving motor corresponding to the transmitting system through a motor control system, changing the position of the infrared laser to change the incident zenith angle, controlling the driving motor corresponding to the forward transmission receiving system through the motor control system, driving the forward transmission receiving system to move, measuring the transmitted light, and repeatedly performing the second step and the third step;

step five, changing the incident azimuth angle

Controlling a steering engine corresponding to the 90-degree guide rail I through a motor control system, enabling the 90-degree guide rail I to rotate for 360 degrees along a 360-degree double-track slide rail, enabling an incident azimuth angle to be changed, and repeatedly performing the second step to the fourth step;

sixthly, calculating BRDF data of gas or liquid sample under normal temperature environment

Placing the polytetrafluoroethylene standard plate into a square closed box, repeating the steps from the first step to the fifth step, and calculating by using a comparison method through a data processing system to obtain a gas or liquid BRDF value and a corresponding image;

step seven, measuring BRDF data of gas or liquid samples at different temperatures

Heating the filled gas or liquid sample in the square closed box through a heating rod, detecting the temperature in the square closed box in real time through a temperature sensor, displaying the temperature on a pressure intensity temperature and humidity display, and repeating the second step to the fifth step after the gas or liquid sample is stabilized; the experiment was repeated with varying temperatures; the data processing system calculates and obtains BRDF values and corresponding images of the samples at different temperatures, and the BRDF values and the corresponding images are stored in a file form;

step eight, measuring BRDF data of gas under different pressures

Changing the pressure in the box body of the square closed box through an air pressure tank, monitoring the pressure in the box in real time through a pressure sensor, displaying the pressure at the moment through a pressure temperature and humidity display, and repeatedly performing the second step to the fifth step after a sample is stabilized; the experiment was repeated with varying pressure; the data processing system calculates BRDF values and corresponding images of the gas or liquid samples under different pressures and stores the BRDF values and the corresponding images in a file form;

step nine, changing the direction angle of the polaroid

Opening the infrared laser, and sequentially adjusting the direction angles of the rotating polarizer to 45 degrees, 90 degrees and 135 degrees to obtain corresponding linearly polarized light; then 1/4 wave plates are added, and the direction angles of the rotating polarizer are sequentially adjusted to 45 degrees and 135 degrees to obtain corresponding circularly polarized light;

step ten, finishing the measurement experiment

And closing the emission system, the back scattering receiving system, the forward transmission receiving system, the detection system, the data processing system and the motor control system, adjusting the pressure in the square airtight box, emptying the sample in the box, and ending the experiment.

Further, in the sixth step, the process of calculating the BRDF value and the corresponding image of the gas or liquid by the data processing system by using the comparison method is as follows:

hemispherical reflectivity rho/pi of bidirectional reflection distribution function of polytetrafluoroethylene standard plate, and gas scattering spectrum L of data processing system_SAnd standard plate scattering spectrum L_bSubstituting the following equation:

wherein f is_r,s(θ_i,φ_i,θ_r,φ_rλ) is the target two-way reflection distribution function, θ_iIs the incident zenith angle, phi, of the measured object_iAt an angle of incidence of the measured object, theta_rIs the emergent zenith angle phi of the measured target_rLambda is the incident light wavelength theta 'is the exit azimuth angle of the measured target'_iIs the incident zenith angle phi of the measured standard plate'_iIs the incident azimuth angle, theta 'of the measured standard plate'_rIs the emergent zenith angle phi of the measured standard plate'_rIs the emergent azimuth angle of the measured standard plate.

Through the design scheme, the invention can bring the following beneficial effects:

1. the invention provides a device and a method for testing the characteristics of a gas/liquid spectrum polarization bidirectional reflection model, wherein the device can be used as an indoor simulator for BRDF (bidirectional reflection distribution function) measurement of gas, gas is filled into a square airtight box indoors to simulate an outdoor environment, the forward transmission and backward scattering polarized light transmission characteristics of the gas are measured at different zenith angles and azimuth angles, different temperature and humidity and different pressure intensities of the gas can be set according to requirements, and simulation of the gas in high altitude or underground is carried out, and BRDF databases under different gases, different temperature and humidity and/or different pressure intensities can be established according to the measurement results of the device. The whole experiment process is driven by the driving motor, so that the harm caused by direct contact with gas is avoided, and the method has certain guiding significance in the aspects of detecting various containers and conveying pipelines, sealing gas leakage of a pump body, gas concentration in coal mines and the like. The gas can also be changed into water mist, smoke, haze and the like to simulate the cloud layer in the air.

2. The invention provides a device and a method for testing the characteristics of a gas/liquid spectral polarization bidirectional reflection model, wherein the device can be used as an indoor simulation device for liquid BRDF measurement, seawater is filled in a square closed box to simulate a marine environment under certain pressure intensity or temperature and humidity conditions, and the polarization characteristics of the sea surface can be mastered by measuring the bidirectional reflection distribution function of the liquid due to different reflectivity comparisons between a pure sea surface and a polluted sea surface.

Drawings

Fig. 1 is a structural block diagram of a gas/liquid spectral polarization bidirectional reflection model characteristic testing device.

Fig. 2 is a partial structure schematic diagram of a gas/liquid spectral polarization bidirectional reflection model characteristic testing device.

Fig. 3 is a three-dimensional orbit diagram in a gas/liquid spectral polarization bi-directional reflection model characteristic testing device.

In the figure: 1-square airtight box, 11-optical window, 12-sample inlet and outlet I, 13-sample inlet and outlet II, 141-steering engine I, 142-steering engine II, 143-steering engine III, 15-360 DEG double-track slide rail, 16-90 DEG guide rail I, 17-90 DEG guide rail II, 18-90 DEG guide rail III, 2-emission system, 21-infrared laser, 22-beam splitter prism, 23-polarizer, 24-1/4 slide, 25-beam expander, 26-optical power meter, 3-back scattering receiving system, 31-convex lens I, 32-spectral polarization camera I, 33-long wave infrared camera I, 34-convex lens II, 4-forward transmission receiving system, 41-convex lens III, 42-spectral polarization camera II, 43-long wave infrared camera II, 44-convex lens IV, 5-detection system, 51-pressure sensor, 52-humidity sensor, 53-temperature sensor, 54-heating rod, 55-air pressure tank, 56-pressure temperature and humidity display, 6-data processing system, 61-computer, 7-motor control system, 8-sample charging and discharging device, 81-valve and 82-conduit.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following examples, and specific embodiments can be determined according to the technical solutions and practical situations of the present invention. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Example 1

As shown in fig. 1, fig. 2 and fig. 3, the gas/liquid spectral polarization bidirectional reflection model characteristic testing device as an indoor simulator for measuring BRDF (bidirectional reflection distribution function) of gas comprises a square closed box 1, an emission system 2, a backscatter receiving system 3, a forward transmission receiving system 4, a detection system 5, a data processing system 6, a motor control system 7 and a sample charging and discharging device 8, wherein the emission system 2, the backscatter receiving system 3 and the forward transmission receiving system 4 are placed on a guide rail in the square closed box 1; the detection system 5 is placed on the side wall of the square airtight box 1; the backscattering receiving system 3 and the forward transmission receiving system 4 are both electrically connected with the data processing system 6, and the backscattering receiving system 3 and the forward transmission receiving system 4 are both electrically connected with the motor control system 7; the sample charging and discharging device 8 is connected with the square airtight box 1 through a conduit 82.

Wherein:

the square airtight box 1 is a square box body made of light-tight materials, a 360-degree double-track sliding rail 15, a 90-degree guide rail I16, a 90-degree guide rail II 17 and a 90-degree guide rail III 18 are arranged in the square airtight box 1, the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18 are all 90-degree arc guide rails, one end of each of the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18 is connected with a steering engine of SM40BL model respectively, the three steering engines are a steering engine I141, a steering engine II 142 and a steering engine III 143 respectively, and the three steering engines are electrically connected with the motor control system 7 through buses; the three steering engines are respectively used for driving three guide rails, namely a 90-degree guide rail I16, a 90-degree guide rail II 17 and a 90-degree guide rail III 18 to move on the 360-degree double-rail slide rail 15; the lower ends of a 90-degree guide rail I16, a 90-degree guide rail II 17 and a 90-degree guide rail III 18 are connected to a 360-degree double-track slide rail 15, degrees are marked on the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18, iron plates are installed on the outer sides of the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18, and a driving motor box body with a driving wheel is installed in the center of each iron plate and used for fixing the transmitting system 2, the backward scattering receiving system 3 and the forward transmission receiving system 4 and controlling the change of a zenith angle and an azimuth angle; the top of the square airtight box 1 is provided with an optical window 11 for visible light illumination; the top and the bottom of the square airtight box 1 are respectively provided with a sample inlet and outlet I12 and a sample inlet and outlet II 13, the sample inlet and outlet I12 and the sample inlet and outlet II 13 are both connected with a guide pipe 82, a valve 81 is arranged at the joint, and the sample inlet and outlet I12 and the sample inlet and outlet II 13 are used for charging and discharging gas with different densities.

The transmitting system 2 comprises an infrared laser 21, a beam splitter prism 22, a polarizer 23, an 1/4 glass slide 24, a beam expander 25 and an optical power meter 26, the infrared laser 21 of Mid-frired (MIR) laser type is arranged in parallel and placed on a 90-degree guide rail I16 to transmit laser of a corresponding waveband, the laser vertically irradiates the beam splitter prism 22, the beam splitter prism 22 adopts a prism produced by American THORLABS, emergent laser is polarized through the polarizer 23, the polarizer 23 is produced by Beijing Yongxing perception information technology Limited company, and the laser can always irradiate the forward transmission receiving system 4 after being expanded by the beam expander 25. After passing through the beam splitter prism 22, the laser emitted from the infrared laser 21 always irradiates a probe of the optical power meter 26 with a beam of light, and the stability of the incident laser can be detected. The launching system 2 is arranged on an iron plate, a driving motor with a driving wheel is arranged in the center of the iron plate, the driving wheel is meshed with a toothed belt of a 90-degree guide rail I16, and the driving motor is electrically connected with a motor control system 7.

The backscattering receiving system 3 comprises a convex lens I31, a spectrum polarization camera I32, a long-wave infrared camera I33 and a convex lens II 34, the spectrum polarization camera I32 and the long-wave infrared camera I33 are electrically connected with the data processing system 6, the convex lens I31 is a lens focal length away from the spectrum polarization camera I32, and the convex lens II 34 is a lens focal length away from the long-wave infrared camera I33. The spectral polarization camera I32 adopts a Piranha4 model camera, and the long-wave infrared camera I33 adopts a Gobi-384 model long-wave infrared imaging camera. The spectrum polarization camera I32 is used for measuring the emergent polarization scattering spectrum of the sample and shooting the polarization imaging state of the sample at a fixed angle, and the long-wave infrared camera I33 is used for shooting the infrared imaging state of the sample at a fixed angle. The backscatter receiving system 3 is fixed on an iron plate and placed on a 90-degree guide rail II 17, a driving motor with a driving wheel is installed in the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail II 17, and the driving motor is electrically connected with the motor control system 7.

The forward transmission receiving system 4 comprises a convex lens III 41, a spectrum polarization camera II 42, a long-wave infrared camera II 43 and a convex lens IV 44, the spectrum polarization camera II 42 and the long-wave infrared camera II 43 are electrically connected with the data processing system 6, the convex lens III 41 is a lens focal length away from the spectrum polarization camera II 42, and the convex lens IV 44 is a lens focal length away from the long-wave infrared camera II 43. The forward transmission receiving system 4 is fixed on an iron plate and is placed on a 90-degree guide rail III 18, a driving motor with a driving wheel is installed in the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail III 18, and the driving motor is electrically connected with a motor control system 7. The forward scattering receiving system 4 and the transmitting system 2 are always on the same straight line, and the light emitted by the transmitting system 2 can always irradiate the forward transmission receiving system 4; the spectrum polarization camera II 42 is used for measuring the emergent polarization scattering spectrum of the sample and shooting the polarization imaging state of the sample at a fixed angle, and the long-wave infrared camera II 43 is used for shooting the infrared imaging state of the sample at a fixed angle.

The detection system 5 comprises a pressure sensor 51, a humidity sensor 52, a temperature sensor 53, a heating rod 54, an air pressure tank 55 and a pressure temperature and humidity display 56, the pressure sensor 51, the humidity sensor 52, the temperature sensor 53 and the heating rod 54 are located on the inner wall of the box body of the square airtight box 1, the pressure sensor 51, the humidity sensor 52 and the temperature sensor 53 are electrically connected with the pressure temperature and humidity display 56 outside the box body of the square airtight box 1, the humidity sensor 52 and the temperature sensor 53 can monitor the temperature and humidity of air in the box in real time, and the temperature and humidity can be displayed through the pressure temperature and humidity display 56. The heating rod 54 can heat some specific gases (for example, salt spray, water mist, inert gases and toxic and harmful gases are forbidden to be heated), the pressure sensor 51 can detect the pressure of the gases in the square airtight box 1 in real time, and the pressure sensor 51 and the air pressure tank 55 are matched to regulate the pressure in the air pressure tank 55. When the pressure of square seal case 1 is greater than the nitrogen pressure between the carbon steel jar body of atmospheric pressure jar 55 and the gasbag, the sample can be crowded into in the gasbag of atmospheric pressure jar 55 under the effect of system's pressure, when the sample that has pressure in the external world gets into the gasbag of atmospheric pressure jar 55 in, the nitrogen gas of sealing in the jar is compressed, according to the gaseous law of boyle, the volume diminishes pressure rising after gas receives the compression, stops into the sample when gaseous pressure in the atmospheric pressure jar 55 and the pressure in the square seal case 1 reach unanimity.

The data processing system 6 includes a computer 61 for acquiring data and images of the backscatter receiving system 3 and the forward transmission receiving system 4 and storing the data.

The motor control system 7 is electrically connected with the transmitting system 2, the back scattering receiving system 3, the forward transmission receiving system 4, the steering engine I141, the steering engine II 142 and the steering engine III 143, and can control the zenith angle and the azimuth angle.

The inflation and deflation device 8 is connected with the square airtight box 1 through a conduit 82, and a valve 81 is a switch, and can be used for inflating gas into the square airtight box 1 and also can be used for evacuating gas.

A method for measuring gas BRDF is characterized in that: the gas/liquid spectrum polarization two-way reflection model characteristic testing device is applied, and the specific method comprises the following steps:

step one, preparing an experimental environment

Cleaning the internal device of the square airtight box 1, and measuring and adjusting the temperature, the humidity and the pressure in the square airtight box 1 so as to meet the required experimental conditions. Fixing each experimental device, calibrating the zero position of the 360-degree double-track slide rail 15, keeping the dark environment in the box body of the square airtight box 1, opening the infrared laser 21, adjusting the polarizer 23, and emitting linearly polarized light in the vibration direction of 0 degree. The 0-degree linearly polarized light is irradiated on the forward transmission receiving system 4 after being expanded by a beam expander 25; another beam of light is directed through the probe of the optical power meter 26 after passing through the splitting prism 22 to observe the readings and keep the readings of the optical power meter 26 stable.

Step two, changing the emergent zenith angle

The optical window 11 of the square closed box 1 is closed, gas to be measured is filled into the square closed box 1 through a guide pipe 82, a valve 81 is arranged on the guide pipe 82 and can be controlled to be opened and closed, and a sample inlet and a sample outlet I12 or a sample inlet and a sample outlet II 13 are selected according to the density of the filled gas to be filled. The launching system 2, the 90 ° guide rail i 16 is kept stationary. The forward transmission receiving system 4, the arc center of the 90-degree guide rail I16 and the transmitting system 2 are always in a straight line. An initial value is set to be 0 degrees, a driving motor of the backscatter receiving system 3 is controlled through a motor control system 7, and an emergent zenith angle is changed at intervals of 10 degrees for 9 times in total. Computer 61 records the measured sample scattering spectrum L of backscatter receiving system 3 and forward transmission receiving system 4_S1And L_S2And shooting the infrared image for storage.

Step three, changing the emergent azimuth angle

The launching system 2, the 90 ° guide rail i 16 is kept stationary. When the gas is relatively stable, the motor control system 7 drives the steering engine II 142 to enable the 90-degree guide rail II 17 to rotate along the 360-degree double-track slide rail 15, the emergent azimuth angle is changed, and 12 position points are measured at intervals of 30 degrees. Computer 61 records backscatter receiving system 3 and forward transmission receiving system 4 measurement sample scatter spectra L'_S1And L'_S2And shooting the infrared image for storage.

Step four, changing the incident zenith angle

The driving motor corresponding to the transmitting system 2 is controlled by the motor control system 7, the position of the infrared laser 21 is changed, the incident zenith angle is changed, the forward transmission receiving system 4 is driven to move, and the transmitted light is measured at intervals of 10 degrees for 9 times in total. And repeating the second step and the third step.

Step five, changing the incident azimuth angle

The driving steering engine I141 can enable the 90-degree guide rail I16 to rotate 360 degrees along the 360-degree double-rail sliding rail 15 in the middle of the square airtight box 1, so that the incident azimuth angle is changed, the measurement is carried out for 12 times at intervals of 30 degrees, and the steps from the second step to the fourth step are repeated.

Sixthly, calculating BRDF data of gas in normal temperature environment

Placing a polytetrafluoroethylene standard plate into a square closed box 1, wherein the hemispherical reflectivity rho/pi of a bidirectional reflection distribution function of the polytetrafluoroethylene standard plate, and a data processing system 6 is used for scattering a spectrum L of the gas_SAnd standard plate scattering spectrum L_bSubstituting the following equation:

wherein f is_r,s(θ_i,φ_i,θ_r,φ_rλ) is the target two-way reflection distribution function, θ_iIs the incident zenith angle, phi, of the measured object_iAt an angle of incidence of the measured object, theta_rIs the emergent zenith angle phi of the measured target_rLambda is the incident light wavelength theta 'is the exit azimuth angle of the measured target'_iIs the incident zenith angle phi of the measured standard plate'_iIs the incident azimuth angle, theta 'of the measured standard plate'_rIs the emergent zenith angle phi of the measured standard plate'_rIs the emergent azimuth angle of the measured standard plate. The data processing system 6 calculates the BRDF value of the gas and the corresponding image.

When the sample is measured, the incident zenith angle and the incident azimuth angle are different, and the recorded spectral values are also different, so that when the formula is used for calculation, the recorded spectral values are substituted into L in the formula_S(θ_i,φ_i,θ_r,φ_r) The two-way reflection distribution function value of the sample under different angles can be obtained, specifically L_S(θ_i,φ_i,θ_r,φ_r) Can be L_S1(θ_i,φ_i,θ_r,φ_r)、L_S2(θ_i,φ_i,θ_r,φ_r)、L′_S1(θ_i,φ_i,θ_r,φ_r) Or L'_S2(θ_i,φ_i,θ_r,φ_r)。

Seventhly, measuring BRDF data of gas at different temperatures

Heating the gas filled in the square airtight box 1 through a heating rod 54, detecting the temperature in the square airtight box 1 in real time through a temperature sensor 53, displaying the temperature on a pressure intensity temperature and humidity display 56, and repeating the second step to the fifth step after the gas is stabilized; the experiment was repeated with varying temperature. The data processing system 6 calculates and obtains the BRDF values and corresponding images of the gas at different temperatures, and stores the BRDF values and the corresponding images in a file form.

Step eight, measuring BRDF data of gas under different pressures

The pressure in the square closed box 1 is changed by gas in the box body through a gas pressure tank 55, the temperature in the box body is monitored in real time through a pressure sensor 51, the pressure at the moment is displayed by a pressure temperature and humidity display 56, and the steps from the second step to the fifth step are repeated after the gas is stabilized; the experiment was repeated with varying pressure. The data processing system 6 calculates and obtains the BRDF values and corresponding images of the gas under different pressures, and stores the BRDF values and the corresponding images in a file form.

Step nine, changing the direction angle of the polarizer

Opening the infrared laser 21, and sequentially adjusting the direction angles of the rotating polarizer 23 to 45 degrees, 90 degrees and 135 degrees to obtain corresponding linearly polarized light; then 1/4 wave plate 24 is added and the direction angle of the rotating polarizer 23 is adjusted to 45 degrees and 135 degrees in turn to obtain corresponding circularly polarized light. The above experiment was repeated for each selection of polarization angle.

Step ten, finishing the measurement experiment

The emission system 2, backscatter receiving system 3, forward transmission receiving system 4, detection system 5, data processing system 6 and motor control system 7 are turned off. And (5) adjusting the pressure intensity in the square airtight box 1 and evacuating the gas in the square airtight box 1 to finish the experiment.

Example 2

As shown in fig. 1, 2 and 3, the gas/liquid spectrum polarization bidirectional reflection model characteristic testing device as an indoor simulator for liquid BRDF measurement comprises a square airtight box 1, an emission system 2, a back scattering receiving system 3, a forward transmission receiving system 4, a detection system 5, a data processing system 6, a motor control system 7 and a sample charging and discharging device 8, wherein the emission system 2 is arranged on a 90-degree guide rail i 16 of the square airtight box 1, the back scattering receiving system 3 is arranged on a 90-degree guide rail ii 17, and the forward transmission receiving system 4 is arranged on a 90-degree guide rail iii 18; the backward scattering receiving system 3 and the forward transmission receiving system 4 are electrically connected with a data processing system 6; instruments in the square airtight box 1 are made of waterproof materials.

The square airtight box 1 is a square box body made of light-tight materials, a 360-degree double-track sliding rail 15, a 90-degree guide rail I16, a 90-degree guide rail II 17 and a 90-degree guide rail III 18 are arranged in the square airtight box 1, the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18 are all 90-degree arc guide rails, the upper ends of the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18 are respectively connected with an SM40BL type steering engine, the three steering engines are respectively a steering engine I141, a steering engine II 142 and a steering engine III 143, the three steering engines are electrically connected with the motor control system 7 through buses, and are respectively used for driving the three guide rails, namely the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18 move on the 360-degree double-track sliding rail 15; the lower ends of a 90-degree guide rail I16, a 90-degree guide rail II 17 and a 90-degree guide rail III 18 are connected to a 360-degree double-track slide rail 15, degrees are marked on the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18, iron plates are installed on the outer sides of the 90-degree guide rail I16, the 90-degree guide rail II 17 and the 90-degree guide rail III 18, and a driving motor box body with a driving wheel is installed in the center of each iron plate; the top of the square airtight box 1 is provided with an optical window 11 for visible light illumination; the top and the bottom of the square airtight box 1 are respectively provided with a sample inlet and outlet I12 and a sample inlet and outlet II 13, the sample inlet and outlet I12 and the sample inlet and outlet II 13 are both connected with a guide pipe 82, and a valve 81 is arranged at the connection position. The sample inlet and outlet I12 is used for filling the liquid sample, and the sample inlet and outlet II 13 is used for discharging the liquid sample.

The transmitting system 2 comprises an infrared laser 21, a beam splitter prism 22, a polarizer 23, an 1/4 glass slide 24, a beam expander 25 and an optical power meter 26, the infrared laser 21 of Mid-frired (MIR) laser type is arranged in parallel and placed on a 90-degree guide rail I16 to transmit laser of a corresponding waveband, the laser vertically irradiates the beam splitter prism 22, the beam splitter prism 22 adopts a prism produced by American THORLABS, emergent laser is polarized through the polarizer 23, the polarizer 23 is produced by Beijing Yongxing perception information technology Limited company, and the laser can always irradiate the forward transmission receiving system 4 after being expanded by the beam expander 25. After passing through the beam splitter prism 22, the laser emitted from the infrared laser 21 always irradiates a probe of the optical power meter 26 with a beam of light, and the stability of the incident laser can be detected. The launching system 2 is arranged on an iron plate, a driving motor with a driving wheel is arranged in the center of the iron plate, the driving wheel is meshed with a toothed belt of a 90-degree guide rail I16, and the driving motor is electrically connected with a motor control system 7.

The backscattering receiving system 3 comprises a convex lens I31, a spectrum polarization camera I32, a long-wave infrared camera I33 and a convex lens II 34, the spectrum polarization camera I32 and the long-wave infrared camera I33 are electrically connected with the data processing system 6, the convex lens I31 is a lens focal length away from the spectrum polarization camera I32, and the convex lens II 34 is a lens focal length away from the long-wave infrared camera I33. The spectral polarization camera I32 adopts a Piranha4 model camera, and the long-wave infrared camera I33 adopts a Gobi-384 model long-wave infrared imaging camera. The spectrum polarization camera I32 is used for measuring the emergent polarization scattering spectrum of the sample and shooting the polarization imaging state of the sample at a fixed angle, and the long-wave infrared camera I33 is used for shooting the infrared imaging state of the sample at a fixed angle. The backscatter receiving system 3 is fixed on an iron plate and placed on a 90-degree guide rail II 17, a driving motor with a driving wheel is installed in the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail II 17, and the driving motor is electrically connected with the motor control system 7.

The forward transmission receiving system 4 comprises a convex lens III 41, a spectrum polarization camera II 42, a long-wave infrared camera II 43 and a convex lens IV 44, the spectrum polarization camera II 42 and the long-wave infrared camera II 43 are electrically connected with the data processing system 6, the convex lens III 41 is a lens focal length away from the spectrum polarization camera II 42, and the convex lens IV 44 is a lens focal length away from the long-wave infrared camera II 43. The forward transmission receiving system 4 is fixed on an iron plate and is placed on a 90-degree guide rail III 18, a driving motor with a driving wheel is installed in the center of the iron plate, the driving wheel is meshed with a toothed belt of the 90-degree guide rail III 18, and the driving motor is electrically connected with a motor control system 7. The forward scattering receiving system 4 and the transmitting system 2 are always on the same straight line, light emitted by the transmitting system 2 can always irradiate the forward transmission receiving system 4, the spectrum polarization camera II 42 is used for measuring a sample emergent polarization scattering spectrum and shooting a sample polarization imaging state under a fixed angle, and the long-wave infrared camera II 43 is used for shooting a sample infrared imaging state under the fixed angle.

The detection system 5 comprises a pressure sensor 51, a humidity sensor 52, a temperature sensor 53, a heating rod 54, an air pressure tank 55 and a pressure and temperature and humidity display 56. The pressure sensor 51 detects the pressure of the liquid in the square closed box 1 in real time, and the pressure sensor 51 is matched with the air pressure tank 55 to regulate the pressure in the air pressure tank 55. When the pressure of square seal case 1 is greater than the nitrogen pressure between the carbon steel jar body of atmospheric pressure jar 55 and the gasbag, the sample can be crowded into in the gasbag of atmospheric pressure jar 55 under the effect of system's pressure, when the sample that has pressure in the external world gets into the gasbag of atmospheric pressure jar 55 in, the nitrogen gas of sealing in the jar is compressed, according to the gaseous law of boyle, the volume diminishes pressure rising after gas receives the compression, stops into the sample when gaseous pressure in the atmospheric pressure jar 55 and the pressure in the square seal case 1 reach unanimity. The heating rod 54 can heat the liquid in the square closed box 1, and the temperature sensor 53 can monitor the temperature and humidity of the liquid in the box in real time and display the temperature and humidity through the pressure intensity temperature and humidity display 56.

The data processing system 6 includes a computer 61 for acquiring data and images of the backscatter receiving system 3 and the forward transmission receiving system 4 and storing the data.

The motor control system 7 is electrically connected with the transmitting system 2, the back scattering receiving system 3, the forward transmission receiving system 4, the steering engine I141, the steering engine II 142 and the steering engine III 143, and can control the zenith angle and the azimuth angle.

The sample filling and discharging device 8 is connected with the square closed box 1 through a conduit 82, and a valve 81 is a switch, so that the device can fill the liquid sample into the square closed box 1 and can also draw the liquid sample out.

A method for measuring liquid BRDF applies the gas/liquid spectrum polarization two-way reflection model characteristic testing device, and the specific measuring method comprises the following steps:

step one, preparing an experimental environment

Cleaning the internal device of the square airtight box 1, and measuring and adjusting the temperature, the humidity and the pressure in the square airtight box 1 so as to meet the required experimental conditions. Fixing each experimental device, calibrating the zero position of the 360-degree double-track slide rail 15, keeping the dark environment in the box body of the square airtight box 1, opening the infrared laser 21, adjusting the polarizer 23, and emitting linearly polarized light in the vibration direction of 0 degree. The 0-degree linearly polarized light is irradiated on the forward transmission receiving system 4 after being expanded by a beam expander 25; another beam of light is directed through the probe of the optical power meter 26 after passing through the splitting prism 22 to observe the readings and keep the readings of the optical power meter 26 stable.

Step two, changing the emergent zenith angle

The optical window 11 of the square closed box 1 is closed, liquid to be measured is filled into the square closed box 1 through a guide pipe 82, a valve 81 is arranged on the guide pipe 82 and can be controlled to be opened and closed, the liquid is filled through the sample inlet and outlet I12, and the liquid is discharged through the sample inlet and outlet II 13. The launching system 2, the 90 ° guide rail i 16 is kept stationary. The centers of the forward transmission receiving system 4 and the arc of the 90-degree guide rail I16 are always on the same straight line with the transmitting system 2. Setting an initial value to be 0 degrees, driving a motor of the back scattering receiving system 3, changing an emergent zenith angle, and taking 10 degrees as an interval for 9 times in total. Computer 61 records the measured sample scattering spectrum L of backscatter receiving system 3 and forward transmission receiving system 4_S1And L_S2And shooting the infrared image for storage.

Step three, changing the emergent azimuth angle

The launching system 2, the 90 ° guide rail i 16 is kept stationary. When the gas is relatively stable, the motor control system 7 drives the steering engine II 142 to enable the 90-degree guide rail II 17 to rotate along the 360-degree double-track slide rail 15, the emergent azimuth angle is changed, and 12 position points are measured at intervals of 30 degrees. Computer 61 records backward scatterSample scattering spectrum L 'is measured by receiving system 3 and forward transmission receiving system 4'_S1And L'_S2And shooting the infrared image for storage.

Step four, changing the incident zenith angle

The driving motor corresponding to the transmitting system 2 is controlled by the motor control system 7, the position of the infrared laser 21 is changed, the incident zenith angle is changed, the forward transmission receiving system 4 is driven, and the transmitted light is measured at intervals of 10 degrees for 9 times in total. And repeating the second step and the third step.

Step five, changing the incident azimuth angle

The driving steering engine I141 can enable the 90-degree guide rail I16 to rotate 360 degrees along the 360-degree double-rail sliding rail 15 in the middle of the square airtight box 1, so that the incident azimuth angle is changed, the measurement is carried out for 12 times at intervals of 30 degrees, and the steps from the second step to the fourth step are repeated.

Sixthly, calculating BRDF data of gas in normal temperature environment

Placing a polytetrafluoroethylene standard plate into a square closed box 1, wherein the hemispherical reflectivity rho/pi of a bidirectional reflection distribution function of the polytetrafluoroethylene standard plate, and a data processing system 6 is used for scattering a spectrum L of the gas_SAnd standard plate scattering spectrum L_bSubstituting the following equation:

wherein f is_r,s(θ_i,φ_i,θ_r,φ_rλ) is the target two-way reflection distribution function, θ_iIs the incident zenith angle, phi, of the measured object_iAt an angle of incidence of the measured object, theta_rIs the emergent zenith angle phi of the measured target_rLambda is the incident light wavelength theta 'is the exit azimuth angle of the measured target'_iIs the incident zenith angle phi of the measured standard plate'_iIs the incident azimuth angle, theta 'of the measured standard plate'_rIs the emergent zenith angle phi of the measured standard plate'_rThe emitting azimuth angle of the measured standard plate is obtained; the data processing system 6 calculates the BRDF value of the gas and the corresponding image.

When the sample is measured, the incident zenith angle and the incident azimuth angle are different, and the recorded spectral values are also different, so that when the formula is used for calculation, the recorded spectral values are substituted into L in the formula_S(θ_i,φ_i,θ_r,φ_r) The two-way reflection distribution function value of the sample under different angles can be obtained, specifically L_S(θ_i,φ_i,θ_r,φ_r) Can be L_S1(θ_i,φ_i,θ_r,φ_r)、L_S2(θ_i,φ_i,θ_r,φ_r)、L′_S1(θ_i,φ_i,θ_r,φ_r) Or L'_S2(θ_i,φ_i,θ_r,φ_r)。

Seventhly, measuring BRDF data of gas at different temperatures

Heating the liquid filled in the square closed box 1 by a heating rod 54, detecting the temperature in the box in real time by a temperature sensor 53, displaying the temperature on a pressure intensity temperature and humidity display 56, and repeating the experimental steps from two to five after the liquid is stabilized; the experiment was repeated with varying temperature. The data processing system 6 calculates and obtains the BRDF values and the corresponding images of the liquid at different temperatures, and stores the BRDF values and the corresponding images in a file form.

Step eight, measuring BRDF data of liquid under different pressures

The liquid in the square closed box 1 changes the pressure in the box body through the air pressure tank 55, the temperature in the box body is monitored in real time through the pressure sensor 51, the pressure at the moment is displayed by the pressure temperature and humidity display 56, and the steps from the second step to the fifth step are repeated after the liquid is stabilized; the experiment was repeated with varying pressure. The data processing system 6 calculates and obtains the BRDF values and the corresponding images of the liquid under different pressures, and stores the BRDF values and the corresponding images in a file form.

Step nine, changing the direction angle of the polarizer

Opening the infrared laser 21, and sequentially adjusting the direction angles of the rotating polarizer 23 to 45 degrees, 90 degrees and 135 degrees to obtain corresponding linearly polarized light; then 1/4 wave plate 24 is added and the direction angle of the rotating polarizer 23 is adjusted to 45 degrees and 135 degrees in turn to obtain corresponding circularly polarized light. The above experiment was repeated for each selection of polarization angle.

Step ten, finishing the measurement experiment

The emission system 2, the backscatter receiving system 3, the forward transmission receiving system 4, the detection system 5, the data processing system 6, and the motor control system 7 are turned off. And adjusting the pressure in the tank and emptying the liquid in the tank to finish the experiment.

The above description is only an example of the method of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.