阅读说明：本技术 光电设备性能参数检测系统 (Photoelectric equipment performance parameter detection system ) 是由 王海晏 王芳 寇人可 毛东辉 于 2019-09-26 设计创作，主要内容包括：公开一种光电设备性能参数检测系统,包括目标测试系统与控制系统两大部件；目标测试系统包括黑体系统和目标传输控制系统,用于模拟被测设备接收到的红外辐射,控制系统包括温度控制、电机控制与结果输出三个模块,用于实现对目标测试系统的控制,以及对输出结果的显示。还提供一种相应的一种光电设备性能参数检测方法。本发明的光电设备性能参数检测系统通过对不同环境、不同阶段目标辐射的传输进行探测和标定,给出探测系统光学探测能力的定量指标,便于携带、测试效率较高、适用于极端恶劣的环境条件,且可推广至各种类型的红外探测系统的性能测试当中。(A detection system for performance parameters of photoelectric equipment is disclosed, which comprises a target test system and a control system; the target test system comprises a blackbody system and a target transmission control system and is used for simulating infrared radiation received by the tested equipment, and the control system comprises a temperature control module, a motor control module and a result output module and is used for realizing control over the target test system and display of an output result. A corresponding method for detecting performance parameters of the optoelectronic device is also provided. The photoelectric equipment performance parameter detection system provided by the invention can detect and calibrate the transmission of target radiation in different environments and different stages, provides quantitative indexes of the optical detection capability of the detection system, is convenient to carry, has higher test efficiency, is suitable for extremely severe environmental conditions, and can be popularized to the performance test of various infrared detection systems.)

1. A photoelectric equipment performance parameter detection system comprises a target test system and a control system; it is characterized in that

First, target test system

The target test system comprises a blackbody system and a target transmission control system and is used for simulating infrared radiation received by the tested equipment, and the target test system specifically comprises the following components:

1) blackbody system

The blackbody system consists of a blackbody main body, a first temperature display module, a temperature regulation and control module and a power supply and is used for completing the simulation of target infrared radiation; the radiation of the black body main body is used for simulating the radiation of a target, and the temperature of the radiation is automatically set by a control system: the control system outputs the temperature value to the temperature regulation and control module through the target model module, the temperature regulation and control module is used for controlling the temperature of the black body main body, and the stability and the temperature resolution of the temperature of the black body main body are determined by the performance of the temperature regulation and control module; the first temperature display module obtains and displays the temperature value of the current black body through a thermocouple sensor arranged on the first temperature display module and transmits the temperature value to the control system in real time; the power supply module is used for supplying power to the black body main body;

2) target transmission control system

The target transmission control system consists of an attenuation sheet group and a collimator and is used for realizing the simulation of the atmospheric environment; the attenuation sheet group consists of attenuation sheet groups consisting of attenuation sheets with different transmittances and attenuation sheet rotating wheels, and is used for simulating different transmission distances and meteorological conditions; the control system outputs a control signal to the attenuation sheet rotating wheel through the motor control module, namely the attenuation sheet in the selected light path; the infrared radiation signal output by the black body main body firstly enters the attenuation sheet group, the attenuation sheet selected by the control system in the attenuation sheet group attenuates the infrared radiation signal, and then the attenuation infrared radiation signal is received by the collimator tube to complete the simulation of the remote infrared radiation signal;

the collimator consists of an off-axis parabolic mirror and a plane reflector and is used for transmitting black body infrared radiation; infrared radiation light of an external point light source is reflected to the main off-axis parabolic mirror through the small plane reflector, the main off-axis parabolic mirror converts the infrared radiation light into parallel light to be emitted, and simulation of infrared radiation of a target at infinity is completed;

the target test system simulates infrared radiation and atmospheric attenuation of a target, the infrared radiation of the black body main body is attenuated by the attenuation sheet set and then received by the collimator, and the tested equipment receives an infrared radiation signal output by the collimator; the simulation of different environments is realized by continuously changing the transmittance of the attenuation sheet group;

second, control system

The control system comprises three modules of temperature control, motor control and result output, and is used for realizing the control of the target test system and the display of the output result, and the control system specifically comprises the following modules:

(1) temperature control module

The temperature control module consists of a target model and a second temperature display control and is used for realizing automatic control of the temperature of the black body; the target model comprises infrared radiation signals of typical point and surface targets, and after an operator selects the target model, the target model calculates the temperature value T corresponding to the infrared radiation signals₀Temperature regulation delivered to blackbody systemThe control module is used for realizing temperature setting of the blackbody system; the second temperature display receives the real-time temperature value T of the black body sent by the first temperature display control of the black body system in real time₁Comparison of T₀And T₁If the difference value is within a certain error range, the operator judges that the temperature setting of the blackbody main body is normal, and the correctness of target simulation is ensured;

(2) motor control module

The motor control module consists of a motor control part and a transmittance query control part and is used for realizing the control of the attenuation sheet set; the motor control component is used for controlling the rotation of the attenuation sheet rotating wheel so as to select attenuation sheets with different transmittances into an optical path; in a default state, the transmittance of the attenuation sheet selected in the optical path is 0.99, which is equivalent to full transmittance; the motor control part also synchronously triggers a transmittance query control to make the queried result value consistent with the transmittance value selected in the current optical path; when the detected equipment cannot detect the target, a voltage signal detection module in the result output module triggers the motor control part to stop working, and the transmittance control part also stops inquiring to finish one-time detection;

(3) result output module

The result output module consists of an atmospheric transmittance experiment database, a voltage signal detection and farthest detection distance control and is used for realizing the final output result of the detection system; a plurality of experimental data tables under different climatic conditions are stored in the atmospheric transmittance experimental database;

the farthest detection distance control is used for displaying the farthest detection distance of the tested equipment, and detecting meteorological conditions and detection probability corresponding to a certain distance; the voltage signal detection module is used for receiving a voltage signal value output by the tested equipment, comparing the voltage signal value with a threshold voltage value of the tested equipment, and triggering the motor control part to stop rotating if the voltage signal value is smaller than the threshold voltage value; the motor control part triggers the transmittance control to stop inquiring immediately; at the moment, the transmittance query control sends the query result to an atmospheric transmittance experiment database, obtains a distance value through query, and sends the distance value to the farthest detection distance control for display.

2. The system for detecting performance parameters of optoelectronic devices as claimed in claim 1, wherein the attenuation slices are divided into two groups, each group consisting of ten attenuation slices with different transmittances; each group is arranged on one attenuation sheet rotating wheel, and two attenuation sheet rotating wheels are needed; the thickness and the diameter of the attenuation sheet are determined according to requirements, and the transmission wavelength is in a selected infrared wavelength range; the size of the attenuation sheet rotating wheel is determined according to the size of the attenuation sheet and the actual requirement.

3. The optoelectronic device performance parameter detection system of claim 2, wherein the transmission rate of each set of attenuation sheets is, from large to small: 0.99, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1; the thickness of the attenuation sheet is 2mm, the diameter of the attenuation sheet is 25.4mm, and the transmission wavelength is 3-5 mu m;

selecting attenuation sheets with different combinations in the table 1 into a light path to complete the simulation of atmospheric environment and transmission distance;

TABLE 1 attenuator group matching data sheet

The caliber of the attenuation sheet rotating wheel is phi 160mm, and the positioning mode is manual ball positioning.

4. The system of claim 1 wherein the collimator is of a closed configuration to eliminate stray light, and has an adjustment mechanism and a removable cover to facilitate periodic light path alignment and adjustment.

5. The detecting system for performance parameters of optoelectronic devices according to claim 4, wherein the parallel light pipe has a length of 1m, an effective aperture of 120mm, a focal length of 650mm, a wave surface distortion PV < λ/5, a distance between two reflectors of 750mm, and a stress-free fixing method is adopted to avoid distortion; the off-axis angle of the off-axis parabolic mirror is 27.5 degrees, the off-axis angle of the secondary reflector is 120 degrees, and meanwhile, the caliber of the off-axis parabolic mirror ensures that the light source assembly cannot block light when defocusing is +/-20 mm.

6. A method for detecting performance parameters of optoelectronic equipment is characterized by comprising the following steps:

the first step is as follows: setting known quantities such as temperature value, initial transmittance and the like of a simulation target;

the second step is that: establishing temporary variable alpha and assigning initial value alpha₀；

The third step: judging whether the tested device can detect the target (namely comparing the output voltage value of the tested device with the threshold voltage value of the tested device); if the output voltage value of the tested device is larger than the threshold voltage value, indicating that the target can be detected, and turning to the fourth step; if the output voltage value of the tested device is less than the threshold voltage value, indicating that the target cannot be detected, and turning to the fifth step;

the fourth step: decreasing the temporary variable alpha by a certain step length (step), and turning to the third step;

the fifth step: outputting a corresponding transmittance value + step length (alpha + step);

and a sixth step: and inquiring a value corresponding to the transmittance (alpha + step) in an atmospheric transmittance experiment database, namely the detection result of the equipment to be detected, and finishing the detection.

7. The method for determining the maximum range of a device under test by an optoelectronic device performance parameter detecting system according to any one of claims 1 to 5, which is an absolute measuring method, is characterized by comprising the following steps:

the first step is as follows: setting an initial value of a variable; i.e. the total number of devices under test N₀Temperature value T of simulation target₀Initial transmittance of alpha₀；

The second step is that: establishing temporary variable N, assigning initial value N ═ N₀Establishing a temporary variable alpha, and assigning an initial value alpha to alpha₀；

The third step: judging whether the temporary variable N is less than 1, if so, ending the detection, and if not, turning to the fourth step;

the fourth step: judging whether a target can be detected or not, and if the target can be detected, turning to the fifth step; if the target can not be detected, the operation goes to the sixth step;

the fifth step: step is reduced by the temporary variable alpha, namely the transmittance value of the attenuation sheet group in the optical path is reduced, and the fourth step is carried out;

and a sixth step: adding step to the current alpha value of the transmittance;

the seventh step: inquiring the action distance corresponding to the transmittance (alpha + step) in an atmospheric transmittance experiment database, wherein the action distance is the maximum action distance of the tested equipment;

eighth step: and (5) reducing the temporary variable N by 1, namely starting to test the second tested device, and switching to the third step.

8. The method for determining the maximum range of a device under test by an optoelectronic device performance parameter detecting system according to any one of claims 1 to 5, which is a direct measurement method in a relative measurement method, is characterized by comprising the following steps:

the first step is as follows: setting an initial value of a variable: temperature value T of simulation target₀Initial transmittance value alpha₀；

The second step is that: establishing temporary variable alpha, assigning initial value alpha-alpha₀；

The third step: judging whether a target can be detected or not, and if the target cannot be detected, turning to the fifth step; if the target can be detected, turning to the fourth step;

the fourth step: step is reduced by the temporary variable alpha, namely the transmittance of the attenuation sheet group in the optical path is reduced, and the third step is carried out;

the fifth step: increasing step for the current transmittance alpha, and turning to the sixth step;

and a sixth step: inquiring an atmospheric transmittance experiment database, and outputting a corresponding action distance of the transmittance (alpha + step) under the current environmental parameters, namely the farthest distance which can be detected by the equipment to be detected; and finishing the detection.

9. The method for measuring the maximum range of a device under test by using the optoelectronic device performance parameter measuring system as claimed in any one of claims 1 to 5, which is an indirect measurement method in the relative measurement method, and comprises the following steps:

the first step is as follows: is provided withInitial values of variables: temperature value T of simulation target₀Initial transmittance value alpha₀E.g. alpha₀＝0.9；

The second step is that: establishing temporary variable alpha, assigning initial value alpha-alpha₀；

The third step: judging whether a target can be detected or not, and if the target can be detected, turning to the fifth step; if the target can not be detected, the fourth step is carried out;

the fourth step: step is reduced by the temporary variable alpha, namely the transmittance of the attenuation sheet group in the optical path is reduced, and the third step is carried out;

the fifth step: step is added to the current alpha value of the transmittance, and the step is shifted to the sixth step;

and a sixth step: and inquiring an atmospheric transmittance experiment database, outputting meteorological conditions and action distances corresponding to the transmittance (alpha + step), and finishing detection.

Technical Field

The invention belongs to the technical field of manufacturing and testing of photoelectric equipment, and particularly relates to a photoelectric equipment performance parameter detection system.

Background

With the advent of the invention (laser, computer, quantum, semiconductor) in the fourth 21 st century, the field of use of photoelectric detection devices in both military and daily life is becoming more and more widespread. The performance indexes of the photoelectric detection equipment are very important for various links such as design and production, daily use, maintenance, repair and the like, so that the detection of the performance indexes of the photoelectric equipment is more and more important. The performance indexes given by the photoelectric equipment performance parameter detection system can enable a user to count in mind, clear whether the equipment reaches the standard or not, and know which index of which equipment has a problem, use the detection equipment in what way to enable the detection effect to be the best, and the like.

Secondly, as the use frequency of the photoelectric detection device increases, the optical performance of the photoelectric detection device is reduced, and even the normal work of the photoelectric detection device is influenced. In addition, environmental conditions greatly affect the performance of the optoelectronic devices, and the performance index of the factory shipment of the optoelectronic devices is usually given under the specific environmental conditions, but some optoelectronic devices cannot work normally under the actual use environment.

At present, the detection of the performance of the photoelectric equipment in the market only stays in the detection of the electrical performance, the problem cannot be solved accurately, and the conditions of good detection and poor performance are often caused. Therefore, a set of complete optical performance detection system provides users with the capability of the optoelectronic device in the actual use environment, and it is very important to ensure that the capability of the device is exerted to the maximum extent.

In order to effectively detect the performance of the photoelectric detection equipment, at present, research is mainly focused on two aspects at home and abroad: one aspect is simulation prediction for system performance. For example, Richard D.B and Jeffrey V.R et al propose dynamic performance prediction models (Richard D. Brewer, Jeffrey V. Richard, John D. McGlynn. an IR seeker/sensordynamic performance prediction model [ J ]. SPIE.1995 (2470): 89-97.), and an L-3 communications company developed a comprehensive model based on system analysis, design and evaluation in cooperation with the American air force laboratory and the naval airline commander (Gerald C. Holt, Keith A. Kraps. model estimation and system performance prediction for ring in-frered search and track (IRST) sensors [ C ] SPIE, 2016, 9820: 98200B). Another aspect is the development of targets for testing optoelectronic devices. The SBIR company of usa at the beginning of this century developed an infrared thermal scene dynamic simulation generator, and the wang-wenjuan and chenliang, etc. of the university of nanjing studios designed a moving target simulation system (wang-wenjuan, infrared search and tracking test technology research [ D ]. nanjing university of studios, 2012: 3-4.), and the guan army, zhuanping, etc. of the chinese academy of sciences designed a dual-light-pipe novel dynamic target simulation spatial target (guan army, research of a novel dynamic target [ D ]. research institute of the chinese academy of sciences, 2005).

Compared with the performance parameter detection system of the photoelectric equipment, the existing simulation prediction focuses on the performance of each component of the detection system, and cannot provide specific indexes after the performance is reduced. The existing photoelectric detection equipment test focuses on the simulation of a target, and detection data for measuring environmental factors are less.

Disclosure of the invention

The invention provides a novel photoelectric equipment performance parameter detection system, and aims to solve the problems that the existing detection system only can detect the electrical performance and the use environment of detected equipment is not considered in use.

A photoelectric equipment performance parameter detection system comprises a target test system and a control system; the method is characterized in that:

first, target test system

The target test system comprises a blackbody system and a target transmission control system and is used for simulating infrared radiation received by the tested equipment, and the target test system specifically comprises the following components:

1) blackbody system

The blackbody system consists of a blackbody main body, a first temperature display module, a temperature regulation and control module and a power supply and is used for completing the simulation of target infrared radiation; the radiation of the black body main body is used for simulating the radiation of a target, and the temperature of the radiation is automatically set by a control system: the control system outputs the temperature value to the temperature regulation and control module through the target model module, the temperature regulation and control module is used for controlling the temperature of the black body main body, and the stability and the temperature resolution of the temperature of the black body main body are determined by the performance of the temperature regulation and control module; the first temperature display module obtains and displays the temperature value of the current black body through a thermocouple sensor arranged on the first temperature display module and transmits the temperature value to the control system in real time; the power supply module is used for supplying power to the black body main body;

2) target transmission control system

The target transmission control system consists of an attenuation sheet group and a collimator and is used for realizing the simulation of the atmospheric environment; the attenuation sheet group consists of attenuation sheet groups consisting of attenuation sheets with different transmittances and attenuation sheet rotating wheels, and is used for simulating different transmission distances and meteorological conditions; the control system outputs a control signal to the attenuation sheet rotating wheel through the motor control module, namely the attenuation sheet in the selected light path; the infrared radiation signal output by the black body main body firstly enters the attenuation sheet group, the attenuation sheet selected by the control system in the attenuation sheet group attenuates the infrared radiation signal, and then the attenuation infrared radiation signal is received by the collimator tube to complete the simulation of the remote infrared radiation signal;

the collimator consists of an off-axis parabolic mirror and a plane reflector and is used for transmitting black body infrared radiation; infrared radiation light of an external point light source is reflected to the main off-axis parabolic mirror through the small plane reflector, the main off-axis parabolic mirror converts the infrared radiation light into parallel light to be emitted, and simulation of infrared radiation of a target at infinity is completed;

the target test system simulates infrared radiation and atmospheric attenuation of a target, the infrared radiation of the black body main body is attenuated by the attenuation sheet set and then received by the collimator, and the tested equipment receives an infrared radiation signal output by the collimator; the simulation of different environments is realized by continuously changing the transmittance of the attenuation sheet group;

second, control system

The control system comprises three modules of temperature control, motor control and result output, and is used for realizing the control of the target test system and the display of the output result, and the control system specifically comprises the following modules:

(1) temperature control module

The temperature control module consists of a target model and a second temperature display control and is used for realizing automatic control of the temperature of the black body; the target model comprises infrared radiation signals of typical point and surface targets, and after an operator selects the target model, the target model calculates the temperature value T corresponding to the infrared radiation signals₀The temperature is transmitted to a temperature regulation and control module of the black body system so as to realize the temperature setting of the black body system; the second temperature display receives the real-time temperature value T of the black body sent by the first temperature display control of the black body system in real time₁Comparison of T₀And T₁If the difference value is within a certain error range, the operator judges that the temperature setting of the blackbody main body is normal, and the correctness of target simulation is ensured;

(2) motor control module

The motor control module consists of a motor control part and a transmittance query control part and is used for realizing the control of the attenuation sheet set; the motor control component is used for controlling the rotation of the attenuation sheet rotating wheel so as to select attenuation sheets with different transmittances into an optical path; in a default state, the transmittance of the attenuation sheet selected in the optical path is 0.99, which is equivalent to full transmittance; the motor control part also synchronously triggers a transmittance query control to make the queried result value consistent with the transmittance value selected in the current optical path; when the detected equipment cannot detect the target, a voltage signal detection module in the result output module triggers the motor control part to stop working, and the transmittance control part also stops inquiring to finish one-time detection;

(3) result output module

The result output module consists of an atmospheric transmittance experiment database, a voltage signal detection and farthest detection distance control and is used for realizing the final output result of the detection system; a plurality of experimental data tables under different climatic conditions are stored in the atmospheric transmittance experimental database;

the farthest detection distance control is used for displaying the farthest detection distance of the tested equipment, and detecting meteorological conditions and detection probability corresponding to a certain distance; the voltage signal detection module is used for receiving a voltage signal value output by the tested equipment, comparing the voltage signal value with a threshold voltage value of the tested equipment, and triggering the motor control part to stop rotating if the voltage signal value is smaller than the threshold voltage value; the motor control part triggers the transmittance control to stop inquiring immediately; at the moment, the transmittance query control sends the query result to an atmospheric transmittance experiment database, obtains a distance value through query, and sends the distance value to the farthest detection distance control for display.

In one embodiment of the invention, the attenuation sheets are specifically divided into two groups, and each group consists of ten attenuation sheets with different transmittances; each group is arranged on one attenuation sheet rotating wheel, and two attenuation sheet rotating wheels are needed; the thickness and the diameter of the attenuation sheet are determined according to requirements, and the transmission wavelength is in a selected infrared wavelength range; the size of the attenuation sheet rotating wheel is determined according to the size of the attenuation sheet and the actual requirement.

In one embodiment of the present invention, the transmittance of each set of attenuation sheets is from large to small: 0.99, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1; the thickness of the attenuation sheet is 2mm, the diameter of the attenuation sheet is 25.4mm, and the transmission wavelength is 3-5 mu m;

selecting attenuation sheets with different combinations in the table 1 into a light path to complete the simulation of atmospheric environment and transmission distance;

TABLE 1 attenuator group matching data sheet

The caliber of the attenuation sheet rotating wheel is phi 160mm, and the positioning mode is manual ball positioning.

In one embodiment of the present invention, the collimator is a closed structure for eliminating stray light, and has an adjusting mechanism and a removable cover for periodic light path calibration and adjustment.

In one embodiment of the invention, the parallel light tube has the length of 1m, the effective caliber of 120mm, the focal length of 650mm, the wave surface deformation PV < lambda/5, the distance between two reflectors of 750mm, and the deformation is avoided by adopting a stress-free fixing mode; the off-axis angle of the off-axis parabolic mirror is 27.5 degrees, the off-axis angle of the secondary reflector is 120 degrees, and meanwhile, the caliber of the off-axis parabolic mirror ensures that the light source assembly cannot block light when defocusing is +/-20 mm.

The method for detecting the performance parameters of the photoelectric equipment is characterized by comprising the following steps:

the first step is as follows: setting known quantities such as temperature value, initial transmittance and the like of a simulation target;

the second step is that: establishing temporary variable alpha and assigning initial value alpha₀；

The third step: judging whether the tested device can detect the target (namely comparing the output voltage value of the tested device with the threshold voltage value of the tested device); if the output voltage value of the tested device is larger than the threshold voltage value, indicating that the target can be detected, and turning to the fourth step; if the output voltage value of the tested device is less than the threshold voltage value, indicating that the target cannot be detected, and turning to the fifth step;

the fourth step: decreasing the temporary variable alpha by a certain step length (step), and turning to the third step;

the fifth step: outputting a corresponding transmittance value + step length (alpha + step);

and a sixth step: and inquiring a value corresponding to the transmittance (alpha + step) in an atmospheric transmittance experiment database, namely the detection result of the equipment to be detected, and finishing the detection.

In one embodiment of the present invention, the method for determining the maximum working distance of the device under test by the optoelectronic device performance parameter detecting system is an absolute measuring method, and is characterized by comprising the following steps:

the first step is as follows: setting an initial value of a variable; i.e. the total number of devices under test N₀Temperature value T of simulation target₀Initial transmittance of alpha₀；

The second step is that: establishing temporary variable N, assigning initial value N ═ N₀Establishing a temporary variable alpha, and assigning an initial value alpha to alpha₀；

The third step: judging whether the temporary variable N is less than 1, if so, ending the detection, and if not, turning to the fourth step;

the fourth step: judging whether a target can be detected or not, and if the target can be detected, turning to the fifth step; if the target can not be detected, the operation goes to the sixth step;

the fifth step: step is reduced by the temporary variable alpha, namely the transmittance value of the attenuation sheet group in the optical path is reduced, and the fourth step is carried out;

and a sixth step: adding step to the current alpha value of the transmittance;

the seventh step: inquiring the action distance corresponding to the transmittance (alpha + step) in an atmospheric transmittance experiment database, wherein the action distance is the maximum action distance of the tested equipment;

eighth step: and (5) reducing the temporary variable N by 1, namely starting to test the second tested device, and switching to the third step.

In one embodiment of the invention, the method for measuring the maximum action distance of the tested device by the optoelectronic device performance parameter detection system is a direct measurement method in a relative measurement method, and is characterized by comprising the following steps:

the first step is as follows: setting an initial value of a variable: temperature value T of simulation target₀Initial transmittance value alpha₀；

The second step is that: establishing temporary variable alpha, assigning initial value alpha-alpha₀；

The third step: judging whether a target can be detected or not, and if the target cannot be detected, turning to the fifth step; if the target can be detected, turning to the fourth step;

the fourth step: step is reduced by the temporary variable alpha, namely the transmittance of the attenuation sheet group in the optical path is reduced, and the third step is carried out;

the fifth step: increasing step for the current transmittance alpha, and turning to the sixth step;

and a sixth step: inquiring an atmospheric transmittance experiment database, and outputting a corresponding action distance of the transmittance (alpha + step) under the current environmental parameters, namely the farthest distance which can be detected by the equipment to be detected; and finishing the detection.

In one embodiment of the invention, the method for measuring the maximum working distance of the tested device by the photoelectric device performance parameter detection system is an indirect measurement method in a relative measurement method, and is characterized by comprising the following steps:

the first step is as follows: setting an initial value of a variable: temperature value T of simulation target₀Initial transmittance value alpha₀E.g. alpha₀＝0.9；

The second step is that: establishing temporary variable alpha, assigning initial value alpha-alpha₀；

The third step: judging whether a target can be detected or not, and if the target can be detected, turning to the fifth step; if the target can not be detected, the fourth step is carried out;

the fourth step: step is reduced by the temporary variable alpha, namely the transmittance of the attenuation sheet group in the optical path is reduced, and the third step is carried out;

the fifth step: step is added to the current alpha value of the transmittance, and the step is shifted to the sixth step;

and a sixth step: and inquiring an atmospheric transmittance experiment database, outputting meteorological conditions and action distances corresponding to the transmittance (alpha + step), and finishing detection.

The photoelectric equipment performance parameter detection system provided by the invention detects and calibrates the transmission of target radiation in different environments and different stages, provides quantitative indexes of the optical detection capability of the detection system, is convenient to carry, has higher test efficiency, is suitable for extremely severe environmental conditions, and can be popularized to the performance test of various infrared detection systems.

Drawings

FIG. 1 is a schematic diagram of the control structure of the optical device performance parameter detection system of the present invention;

FIG. 2 is a schematic diagram of the blackbody system of the present invention;

FIG. 3 is a schematic diagram of the structure of an attenuator group according to the present invention;

FIG. 4 is a schematic view of the collimator of the present invention;

FIG. 5 is a flow chart of a method for detecting performance parameters of an optoelectronic device according to the present invention;

FIG. 6 is a flow chart of absolute maximum range measurement of the present invention;

FIG. 7 is a flow chart of the present invention for maximum range versus direct measurement;

FIG. 8 is a flow chart of the maximum range versus indirect measurement of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The performance detection system of the optoelectronic device firstly depends on a stored target model related to information such as target infrared radiation directivity, three-view surface area, surface coating and the like, outputs corresponding infrared radiation quantity according to a specified situation, adjusts the temperature of a black body through a driving plate, changes the aperture of an iris diaphragm, realizes the simulation of the infrared radiation of a target, and simultaneously changes the aperture of the iris diaphragm according to distance information, and realizes the simulation of the size of a target image point in a short distance; secondly, changing the transmittance through the combination of the attenuation sheets according to the distance and the different transmission conditions, and simulating the atmospheric attenuation under different distances and different transmission conditions; and finally, receiving detection information sent by the tested equipment and outputting a corresponding measurement result.

Fig. 1 shows a schematic control structure of the optoelectronic device performance parameter detection system of the present invention. For convenience of explanation, only portions relevant to the present invention are shown.

The detection system comprises two parts, namely a target test system and a control system.

First, composition and function of target test system

The target test system comprises a blackbody system and a target transmission control system and is used for simulating infrared radiation received by the tested equipment, and the target test system specifically comprises the following components:

1) blackbody system

As shown in fig. 2, the blackbody system is composed of a blackbody main body, a first temperature display module, a temperature control module and a power supply, and is used for completing the simulation of target infrared radiation. The radiation of the black body main body is used for simulating the radiation of a target, and the temperature of the radiation is automatically set by a control system: the control system outputs the temperature value to the temperature regulation and control module through the target model module, the temperature regulation and control module is used for controlling the temperature of the black body main body, and the stability and the temperature resolution of the temperature of the black body main body are determined by the performance of the temperature regulation and control module. The first temperature display module obtains and displays the temperature value of the current black body through a thermocouple sensor arranged on the first temperature display module and transmits the temperature value to the control system in real time. The power module is used for supplying power to the black body main body.

Performance indexes of the temperature regulation module are as follows:

temperature range: (50-999) DEG C;

temperature resolution: 0.1 ℃;

temperature stability: +/-0.5 ℃/h;

an input mode is as follows: a thermocouple platinum resistor;

and (3) relay contact output: 250V AC 3A (loaded);

and (3) voltage pulse output: 0-12V DC;

and (3) current output: 4-20mA DC;

load voltage: 100V AC 200V AC;

the control mode is as follows: and (4) PID intelligent regulation.

2) Target transmission control system

The target transmission control system consists of an attenuation sheet group and a collimator and is used for simulating the atmospheric environment. As shown in fig. 3, the attenuation sheet group is composed of attenuation sheets with different transmittances and an attenuation sheet runner. The device is used for simulating different transmission distances and meteorological conditions. The control system outputs a control signal to the attenuation sheet rotating wheel through the motor control module, namely the attenuation sheet in the selected light path. The infrared radiation signal output by the black body main body firstly enters the attenuation sheet group, the attenuation sheet selected by the control system in the attenuation sheet group attenuates the infrared radiation signal, and then the attenuation infrared radiation signal is received by the collimator tube and is used for simulating the radiation signal at the non-remote place.

The attenuation sheet is an important component of the present invention. In one embodiment of the present invention, the attenuation sheets are specifically divided into two groups, each group consisting of ten attenuation sheets with different transmittances. The transmittance is as follows: 0.99, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1. Each set is mounted on one attenuator wheel, requiring a total of two attenuator wheels. The thickness of each attenuation sheet is determined as required, for example 2mm, the transmission wavelength is in a selected infrared wavelength range, for example 3-5 μm (medium wave infrared), and the diameter of the attenuation sheet is determined as required, for example 25.4 mm. Typically, shelf product attenuation sheets are purchased and, therefore, the thickness and diameter of the attenuation sheet are common values.

The attenuator wheel is used for controlling the rotation and the positioning of the attenuator. The structure of the filter is similar to an electric filter rotating wheel (number: FPSMA-SFW-9-25.4) of Fuguanjing optical instrument company. The size of the attenuation sheet wheel is determined according to the size of the attenuation sheet. In one embodiment of the invention, the caliber of the rotating wheel is 160mm, the positioning mode is manual ball positioning, and the positioning precision reaches 60 ″.

As shown in fig. 4, the collimator is composed of 1 off-axis parabolic mirror and 1 facet mirror, and is used for transmitting black body infrared radiation. The off-axis optical system requires better performance of resisting stray light and interference of product heat radiation. The collimator tube should be of a closed structure for eliminating stray light, and has an adjusting mechanism and a detachable outer cover for periodic light path calibration and adjustment. Infrared radiation light of an external point light source is reflected to the main off-axis parabolic mirror through the small plane reflector, the main off-axis parabolic mirror converts the infrared radiation light into parallel light to be emitted, and simulation of infrared radiation of a target at infinity is completed.

In one embodiment of the invention, the length of the parallel light tube is 1m, the effective caliber is 120mm, the focal length is 650mm, the wave surface deformation PV is less than lambda/5, the distance between the two reflectors is 750mm, and a stress-free fixing mode is adopted to avoid deformation. The off-axis angle of the off-axis parabolic mirror is 27.5 degrees, the off-axis angle of the secondary reflector is 120 degrees, and meanwhile, the caliber of the off-axis parabolic mirror ensures that the light source assembly cannot block light when defocusing is +/-20 mm.

The target test system simulates infrared radiation and atmospheric attenuation of a target, the infrared radiation of the black body main body is received by the collimator after being attenuated by the attenuation sheet set, and the tested equipment receives an infrared radiation signal output by the collimator. Through constantly changing the transmissivity of attenuation piece group, realize the simulation to different environment, compare the voltage signal of equipment under test output with threshold voltage signal, can judge equipment under test's stability of performance, furtherly, through inquiring about atmospheric transmission rate experiment database, can obtain equipment under test's furthest detection distance.

Secondly, controlling the composition and function of the system

As shown in fig. 1, the control system includes three modules, namely a temperature control module, a motor control module and a result output module, and is used for controlling the target test system and displaying an output result, specifically as follows:

1) temperature control module

The temperature control module consists of a target model and a second temperature display control and is used for realizing automatic control of the temperature of the black body. The target model comprises infrared radiation signals of typical point and surface targets, and the operatorAfter the target model is selected, the target model calculates a temperature value T corresponding to the infrared radiation signal obtained by the target model₀And the temperature is transmitted to a temperature regulation and control module of the blackbody system so as to realize the temperature setting of the blackbody system. The second temperature display receives the real-time temperature value T of the black body sent by the first temperature display control of the black body system in real time₁Comparison of T₀And T₁If the difference value is within a certain error range (+ -0.1 ℃), an operator can judge that the temperature setting of the blackbody main body is normal, and the accuracy of target simulation is ensured.

2) Motor control module

The motor control module consists of a motor control part and a transmittance query control part and is used for controlling the attenuation sheet set. The motor control component is used for controlling the rotation of the attenuation sheet rotating wheel so as to select attenuation sheets with different transmittances into an optical path. In the default state, the transmittance of the attenuation sheet selected in the optical path is 0.99. In one embodiment of the present invention, the transmittance of 0.99 corresponds to total transmittance. The motor control part also synchronously triggers the transmittance query control to make the queried result value consistent with the transmittance value selected in the current optical path. When the tested device cannot detect the target, the voltage signal detection module in the result output module triggers the motor control part to stop working, the transmittance control part also stops inquiring, and one-time detection is completed.

A motor control module in the control system drives the two attenuation sheet sets to rotate, and the attenuation sheets with different combinations in the table 1 are selected into a light path to complete the simulation of the atmospheric environment and the transmission distance.

TABLE 1 attenuator group matching data sheet

3) Result output module

And the result output module consists of an atmospheric transmittance experiment database, a voltage signal detection and farthest detection distance control and is used for realizing the final output result of the detection system. The atmospheric transmittance experimental database stores a plurality of experimental data tables under different climatic conditions, and the format of the experimental data tables is shown in table 2.

Table 2 data table of dimension in sunny days in summer

The farthest detection distance control is used for displaying the farthest detection distance of the tested equipment, the meteorological condition corresponding to a certain detection distance and the detection probability. The voltage signal detection module is used for receiving a voltage signal value output by the tested equipment, comparing the voltage signal value with a threshold voltage value of the tested equipment, and triggering the motor control part to stop rotating if the voltage signal value is smaller than the threshold voltage value. The motor control unit then triggers the transmittance control to stop querying. At the moment, the transmittance query control sends the query result to an atmospheric transmittance experiment database, obtains a distance value through query, and sends the distance value to the farthest detection distance control for display.

The simulation of the infrared targets in different situations and different distances is realized by adjusting the temperature of the black body, the shape of the diaphragm, the aperture size and the combination of the attenuation sheet through the control system. The control system can realize the simulation of point source infrared radiation at different angles by adjusting the aperture size of the iris diaphragm in the black body main body; the blackbody main body can also be guided to select different target types to complete the simulation of the infrared radiation of the surface target. The variable attenuation sheet is made and then calibrated using a standard infrared radiometer and a black body.

The invention also provides a method for detecting the performance parameters of the photoelectric equipment. The specific flow is shown in fig. 5.

The first step is as follows: setting known quantities such as temperature value, initial transmittance and the like of a simulation target;

the second step is that: establishing temporary variable alpha and assigning initial value alpha₀；

The third step: and judging whether the tested device can detect the target (namely comparing the output voltage value of the tested device with the threshold voltage value). If the output voltage value of the tested device is larger than the threshold voltage value, indicating that the target can be detected, and turning to the fourth step; if the output voltage value of the tested device is less than the threshold voltage value, indicating that the target cannot be detected, and turning to the fifth step;

the fourth step: the temporary variable alpha is decreased by a certain step size (step) and the process proceeds to the third step.

The fifth step: the corresponding transmittance value + step size (α + step) is output.

And a sixth step: and inquiring a value corresponding to the transmittance (alpha + step) in an atmospheric transmittance experiment database, namely the detection result of the equipment to be detected, and finishing the detection.

The system has a few variations of the detection method according to different detection tasks, and the present invention is further described with reference to the drawings and the embodiments.

In one embodiment of the present invention, the optoelectronic device performance parameter detection system can perform two functions: firstly, the maximum acting distance of the tested equipment is measured; and secondly, judging the reliability of the detection probability of the tested equipment. In this embodiment of the present invention, the maximum working distance is determined by two methods: absolute measurement and relative measurement. Relative measurement can be divided into two methods: direct measurement and indirect measurement.

The absolute measurement is to perform a target discovery test on different tested devices under the condition that all parameters of the test system are set to be the same, and only reduce the transmittance of the attenuation sheet in the test process until the tested devices cannot detect the target, so that the action distance corresponding to the previous transmittance of the attenuation sheet at the moment can be regarded as the maximum detection capability value of the tested devices. Different devices under test have different or the same values, which can be compared with each other. The maximum range absolute measurement flow is shown in fig. 6.

The first step is as follows: setting an initial value of a variable. I.e. the total number of devices under test N₀Temperature value T of simulation target₀Initial transmittance of alpha₀；

The second step is that: establishing temporary variable N, assigning initial value N ═ N₀Establishing a temporary variable alpha, and assigning an initial value alpha to alpha₀；

The third step: judging whether the temporary variable N is less than 1, if so, ending the detection, and if not, turning to the fourth step;

the fourth step: judging whether a target can be detected or not, and if the target can be detected, turning to the fifth step; if the target can not be detected, the operation goes to the sixth step;

the fifth step: step is reduced by the temporary variable alpha, namely the transmittance value of the attenuation sheet group in the optical path is reduced, and the fourth step is carried out;

and a sixth step: adding step to the current alpha value of the transmittance;

the seventh step: inquiring the action distance corresponding to the transmittance (alpha + step) in an atmospheric transmittance experiment database, wherein the action distance is the maximum action distance of the tested equipment;

eighth step: and (5) reducing the temporary variable N by 1, namely starting to test the second tested device, and switching to the third step.

Direct measurement in relative measurement: namely, after the target, the height, the speed and the environmental parameters of the tested device are given, the maximum working distance of the tested device is detected. And selecting the attenuation sheet with the transmittance of 0.99 into the light path, starting the test system, and detecting the black body of the simulation target by using the tested equipment. If the tested equipment has no output, the detection capability is very weak, and the normal work cannot be realized; and if the tested equipment has output, gradually reducing the transmittance value of the attenuation sheet until the tested equipment has no output, and recording the transmittance value in the light path at the moment. And under the condition of inquiring the environmental parameter in an atmospheric transmittance experiment database, the action distance value corresponding to the transmittance of the atmosphere in the transmittance is the maximum action distance of the tested equipment. The maximum range versus direct measurement flow is shown in fig. 7.

The first step is as follows: setting an initial value of a variable: temperature value T of simulation target₀Initial transmittance value alpha₀；

The second step is that: establishing temporary variable alpha, assigning initial value alpha-alpha₀；

The third step: judging whether a target can be detected or not, and if the target cannot be detected, turning to the fifth step; if the target can be detected, turning to the fourth step;

the fourth step: step is reduced by the temporary variable alpha, namely the transmittance of the attenuation sheet group in the optical path is reduced, and the third step is carried out;

the fifth step: increasing step for the current transmittance alpha, and turning to the sixth step;

and a sixth step: and inquiring an atmospheric transmittance experiment database, and outputting a corresponding action distance of the transmittance (alpha + step) under the current environmental parameters, namely the farthest distance which can be detected by the equipment to be detected. And finishing the detection.

The indirect measurement method in the relative measurement is to further determine the maximum acting distance through environmental parameters under the condition of the same transmittance. The method is the same as the method, firstly, the attenuation sheet with the transmittance of 0.99 is selected into the light path, the test system is started, and the tested equipment is used for detecting the blackbody of the simulation target. If the tested equipment has no output, the detection capability is very weak, and the normal work cannot be realized; and if the tested equipment has output, gradually reducing the transmittance value of the attenuation sheet until the tested equipment has no output, and recording the transmittance value in the light path at the moment. Different from the above method, at this time, the atmospheric transmittance experiment database is queried, and there may be a plurality of range values corresponding to one transmittance at the transmittance, and it is further required to determine one of the range values as the maximum range value of the measurement according to the meteorological conditions of the measurement environment. The maximum range versus indirect measurement flow chart is shown in fig. 8.

The first step is as follows: setting an initial value of a variable: temperature value T of simulation target₀Initial transmittance value alpha₀；

The second step is that: establishing temporary variable alpha, assigning initial value alpha-alpha₀；

The third step: judging whether a target can be detected or not, and if the target can be detected, turning to the fifth step; if the target can not be detected, the fourth step is carried out;

the fourth step: step is reduced by the temporary variable alpha, namely the transmittance of the attenuation sheet group in the optical path is reduced, and the third step is carried out;

the fifth step: step is added to the current alpha value of the transmittance, and the step is shifted to the sixth step;

and a sixth step: and inquiring an atmospheric transmittance experiment database, outputting meteorological conditions and action distances corresponding to the transmittance (alpha + step), and finishing detection.

In the embodiment of the invention, the reliability of the detection probability of the tested equipment is judged. The blackbody system simulates the radiation of a target according to a certain rule change under the control of the control system, the target transmission control system simulates atmospheric transmission and distance, a target radiation signal is projected to the tested equipment after being attenuated by the atmosphere, the control system records the response times of the tested equipment, then the detection probability of the tested equipment is calculated through the set test times and a maximum likelihood estimation method in statistics, the tested equipment is compared with the theoretical detection probability after being tested for multiple times, and if the relative error between the test probability and the theoretical probability is within a certain range, the performance of the photoelectric detection system is considered to be stable; if the experimental probability is far greater than the theoretical probability, the photoelectric detection system is stable in performance and reliable.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.