Humidity detection method and device under high-temperature, high-humidity, high-dust and high-corrosion environment
阅读说明：本技术 高温高湿高粉尘高腐蚀环境下的湿度检测方法及装置 (Humidity detection method and device under high-temperature, high-humidity, high-dust and high-corrosion environment ) 是由 朱平 邱利明 曾令文 刘嘉俊 陈益思 蓝权明 于 2019-09-10 设计创作，主要内容包括：本发明公开一种高温高湿高粉尘高腐蚀环境下的湿度检测方法及装置,方法包括：(1)提供一光源及一可产生镜面反射的凝露板；(2)通过光源照射到凝露板上产生全反射光,对全反射光进行光电转换而产生第一电信号；(3)让凝露板在高温高湿环境下产生凝露,并通过光源照射凝露板上并产生散射光,对散射光进行光电转换而产生第二电信号；(4)以接收到第一电信号及第二电信号的时刻为时间点,检测凝露板凝露和露散时的温度,确定露点温度；(5)通过所测到的露点温度及被测环境的温度,计算出被测环境的湿度大小；(6)多次重复上述步骤(2)～(5),以得出被测环境湿度的平均值。本发明能够在高温高湿高粉尘高腐蚀环境下检测湿度。(The invention discloses a humidity detection method and a humidity detection device under a high-temperature, high-humidity, high-dust and high-corrosion environment, wherein the method comprises the following steps: (1) providing a light source and a condensation plate capable of generating mirror reflection; (2) irradiating the condensation plate by a light source to generate total reflection light, and performing photoelectric conversion on the total reflection light to generate a first electric signal; (3) allowing the condensation plate to generate condensation under a high-temperature and high-humidity environment, irradiating the condensation plate through a light source to generate scattered light, and performing photoelectric conversion on the scattered light to generate a second electric signal; (4) detecting the temperatures of the condensation plate during condensation and dispersion by taking the time when the first electric signal and the second electric signal are received as time points, and determining the dew point temperature; (5) calculating the humidity of the detected environment according to the measured dew point temperature and the temperature of the detected environment; (6) repeating the steps (2) to (5) for multiple times to obtain the average value of the measured ambient humidity. The invention can detect the humidity in the environment with high temperature, high humidity, high dust and high corrosion.)
1. A humidity detection method under a high-temperature, high-humidity, high-dust and high-corrosion environment is used for humidity detection under the high-temperature, high-humidity, high-dust and high-corrosion environment, and is characterized by comprising the following steps:
(1) providing a light source and a condensation plate capable of generating mirror reflection;
(2) irradiating the condensation plate by the light source to generate total reflection light, and performing photoelectric conversion on the total reflection light to generate a first electric signal;
(3) allowing the condensation plate to generate condensation under a high-temperature and high-humidity environment, irradiating the condensation plate through the light source to generate scattered light, and performing photoelectric conversion on the scattered light to generate a second electric signal;
(4) detecting the temperatures of the condensation plate during condensation and dispersion by taking the time when the first electric signal and the second electric signal are received as time points, and determining the dew point temperature;
(5) calculating the humidity of the detected environment according to the dew point temperature and the temperature of the detected environment measured in the step (4);
(6) repeating the steps (2) to (5) for multiple times to obtain the average value of the measured ambient humidity.
2. The method according to claim 1, wherein in step (2), a total reflection photoelectric receiver is provided, the total reflection photoelectric receiver receives the total reflection light and converts the total reflection light into the first electrical signal, and a total reflection light guide tube is provided, and the total reflection light is transmitted to the total reflection photoelectric receiver through the total reflection light guide tube.
3. The method according to claim 1, wherein in step (3), a scattering photoelectric receiver is provided, the scattering photoelectric receiver receives the scattered light and converts the received scattered light into the second electrical signal, and a scattering light guide pipe is provided, and the scattered light is transmitted to the scattering photoelectric receiver through the scattering light guide pipe.
4. The method for detecting humidity under high-temperature, high-humidity, high-dust and high-corrosion environment according to claim 1, wherein in the step (1), the surface of the condensation plate capable of generating specular reflection is a mirror surface, a mirror surface temperature sensor is arranged on the mirror surface, and an environment temperature sensor is arranged on the back side of the mirror surface.
5. The method for detecting humidity under high-temperature, high-humidity, high-dust and high-corrosion environment according to claim 1, further comprising an air blowing cooling pipe driven by an air pump, wherein the air blowing cooling pipe can blow air to the mirror surface to adjust the temperature of the mirror surface so that the temperature of the mirror surface is lower than the condensation temperature of smoke.
6. The utility model provides a humidity detection device under high humidity high dust high corrosion environment which characterized in that includes:
the device comprises a light source, an incident light guide pipe, a total reflection light guide pipe, a scattered light guide pipe, a condensation plate capable of generating mirror reflection, a total reflection photoelectric receiver and a scattered photoelectric receiver, wherein a mirror surface temperature sensor is arranged on one surface of the condensation plate capable of generating mirror reflection;
when the condensation plate is in a dry state, the light source conducts light through the incident light guide pipe and irradiates the condensation plate, total reflection light is generated on the condensation plate, and the total reflection light is conducted to the total reflection photoelectric receiver through the total reflection light guide pipe and converted into a first electric signal;
the condensation plate generates condensation under a high-temperature and high-humidity environment, the light source conducts light through the incident light guide pipe and irradiates the condensation plate to generate scattered light, and the scattered light is conducted to the scattering photoelectric receiver through the scattered light guide pipe and converted into a second electric signal;
and detecting the temperatures of the condensation plate during condensation and dispersion by taking the time when the first electric signal and the second electric signal are received as time points, determining the dew point temperature, and calculating the humidity of the detected environment according to the dew point temperature and the temperature of the detected environment.
7. The device for detecting humidity under high temperature, high humidity, high dust and high corrosion environment according to claim 6, further comprising a tubular housing, wherein the incident light pipe, the total reflection light pipe and the scattering light pipe are all disposed inside the tubular housing, and the condensation plate is disposed at a position facing the front side of the tubular housing.
8. The humidity detecting device under the environment of high temperature, high humidity, high dust and high corrosion according to claim 7, wherein the condensation plate is covered with a gas-permeable filtering protective cover for filtering dust.
9. The apparatus according to claim 7, wherein the surface of the condensation plate capable of generating specular reflection is a mirror surface, and an ambient temperature sensor is disposed on the back side of the condensation plate.
10. The apparatus according to claim 9, further comprising an air-blowing cooling tube driven by an air pump, wherein the air-blowing cooling tube can blow air to the mirror surface to adjust the temperature of the mirror surface to be lower than the condensation temperature of the flue gas.
Technical Field
The invention relates to the technical field of humidity detection, in particular to a humidity detection method and device under a high-temperature, high-humidity, high-dust and high-corrosion environment.
Background
The smoke and dust fume discharged from fixed pollution sources such as chimneys and the like has the characteristics of high temperature, high humidity, high dust and high corrosion, a resistance-capacitance method is almost adopted when the humidity of the smoke and dust fume discharged from the fixed pollution sources such as chimneys and the like is detected, and the resistance-capacitance method is limited by temperature conditions when the humidity is detected, for example, the environment temperature is higher than one temperature (most of the resistance-capacitance methods are used for detecting the humidity at present, the detection temperature of equipment cannot exceed 200 ℃).
In addition, when the resistance-capacitance method is used for detecting the humidity of fixed pollution sources such as a chimney, a humidity probe is easily polluted by dust under the conditions of high temperature, high humidity and high dust, and unnecessary troubles are brought to detection to a certain extent.
In addition, when a resistance-capacitance method is used for carrying out humidity test on fixed pollution sources such as a chimney, the price of a humidity test probe is very high, and the temperature which can be borne by a current commonly-used humidity detection probe is about 200 ℃, so that the probe can be easily damaged by being unable to be repaired when the temperature exceeds the temperature, and the production cost and the use cost of the whole equipment are greatly increased by a small humidity probe.
Therefore, there is a need for a humidity detection method and apparatus that can withstand higher temperatures without damage and can detect humidity quickly and accurately.
Disclosure of Invention
The invention aims to provide a humidity detection method and a humidity detection device which can tolerate higher temperature without damage and can quickly and accurately detect humidity
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a humidity detection method under a high-temperature, high-humidity, high-dust and high-corrosion environment is used for humidity detection under the high-temperature, high-humidity, high-dust and high-corrosion environment and comprises the following steps:
(1) providing a light source and a condensation plate capable of generating mirror reflection;
(2) irradiating the condensation plate by the light source to generate total reflection light, and performing photoelectric conversion on the total reflection light to generate a first electric signal;
(3) allowing the condensation plate to generate condensation under a high-temperature and high-humidity environment, irradiating the condensation plate through the light source to generate scattered light, and performing photoelectric conversion on the scattered light to generate a second electric signal;
(4) detecting the temperatures of the condensation plate during condensation and dispersion by taking the time when the first electric signal and the second electric signal are received as time points, and determining the dew point temperature;
(5) calculating the humidity of the detected environment according to the dew point temperature and the temperature of the detected environment measured in the step (4);
(6) repeating the steps (2) to (5) for multiple times to obtain the average value of the measured ambient humidity.
In the step (2), a total reflection photoelectric receiver is provided, the total reflection photoelectric receiver receives the total reflection light and converts the total reflection light into the first electric signal, and a total reflection light guide pipe is provided, and the total reflection light is transmitted to the total reflection photoelectric receiver through the total reflection light guide pipe.
In the step (3), a scattering photoelectric receiver is provided, the scattering photoelectric receiver receives the scattering light and converts the scattering light into the second electrical signal, and a scattering light guide pipe is provided, and the scattering light is transmitted to the scattering photoelectric receiver through the scattering light guide pipe.
In the step (1), one surface of the condensation plate capable of generating mirror reflection is a mirror surface, a mirror surface temperature sensor is arranged on the mirror surface, and an environment temperature sensor is arranged on the back side of the mirror surface.
And (3) further comprising an air blowing cooling pipe driven by an air pump, wherein the air blowing cooling pipe can blow air to the mirror surface to adjust the temperature of the mirror surface, so that the temperature of the mirror surface is lower than the condensation temperature of the smoke.
In order to achieve the above object, the present invention further provides a humidity detection device under a high temperature, high humidity, high dust and high corrosion environment, comprising: the device comprises a light source, an incident light guide pipe, a total reflection light guide pipe, a scattered light guide pipe, a condensation plate capable of generating mirror reflection, a total reflection photoelectric receiver and a scattered photoelectric receiver, wherein a mirror surface temperature sensor is arranged on one surface of the condensation plate capable of generating mirror reflection;
when the condensation plate is in a dry state, the light source conducts light through the incident light guide pipe and irradiates the condensation plate, total reflection light is generated on the condensation plate, and the total reflection light is conducted to the total reflection photoelectric receiver through the total reflection light guide pipe and converted into a first electric signal;
the condensation plate generates condensation under a high-temperature and high-humidity environment, the light source conducts light through the incident light guide pipe and irradiates the condensation plate to generate scattered light, and the scattered light is conducted to the scattering photoelectric receiver through the scattered light guide pipe and converted into a second electric signal;
detecting the temperatures of the condensation plate during condensation and dispersion by taking the time when the first electric signal and the second electric signal are received as time points, determining the dew point temperature, and calculating the humidity of the detected environment according to the dew point temperature and the temperature of the detected environment;
the condensation device is characterized by further comprising a tubular shell, wherein the incident light guide pipe, the total reflection light guide pipe and the scattered light guide pipe are arranged inside the tubular shell, and the condensation plate is arranged right opposite to the front side of the tubular shell.
The outside cladding of condensation board has a ventilative filtration safety cover that is used for filtering the dust.
The surface of the condensation plate capable of generating mirror reflection is a mirror surface, and an environment temperature sensor is arranged on the back side of the condensation plate.
The air blowing cooling pipe can blow air to the mirror surface to adjust the temperature of the mirror surface, so that the temperature of the mirror surface is lower than the condensation temperature of smoke.
Compared with the prior art, in the humidity detection method under the high-temperature, high-humidity, high-dust and high-corrosion environment, the light source irradiates the condensation plate to generate total reflection light, and the total reflection light is subjected to photoelectric conversion to generate a first electric signal; allowing the condensation plate to generate condensation under a high-temperature and high-humidity environment, irradiating the condensation plate through the light source to generate scattered light, and performing photoelectric conversion on the scattered light to generate a second electric signal; when the dynamic balance of the first electric signal and the second electric signal is adjusted, the temperature of the condensation plate is the dew point temperature; deducing the humidity of the condensation plate according to the measured dew point temperature; the test was repeated to obtain an average value of the measured ambient humidity. Therefore, the detection process is not influenced by the temperature of the test environment, and the detection result can be accurately and quickly output.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.
Drawings
FIG. 1 is a block diagram showing the flow of the humidity detection method under the high temperature, high humidity, high dust and high corrosion environment.
Fig. 2 is a schematic view of an embodiment of a humidity detection apparatus in a high temperature, high humidity, high dust and high corrosion environment according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The invention discloses a humidity detection method and a humidity detection device under a high-temperature, high-humidity, high-dust and high-corrosion environment. Therefore, all the embodiments of the present invention are explained on the premise of detecting the humidity of the smoke and dust fume of the chimney, and certainly, the technical scheme provided by the present invention is not limited to detecting the humidity of the smoke and dust fume discharged from the chimney, and can also detect the humidity of other fixed pollution sources, and the conventional technical means "resistance-capacitance method" can not realize a high-temperature, high-humidity, high-dust and high-corrosion environment for detecting the humidity, and the technical scheme provided by the present invention can be perfectly realized.
Referring to fig. 1 and 2, a humidity detection method under a high-temperature, high-humidity, high-dust and high-corrosion environment provided by an embodiment of the present invention is used for humidity detection under a high-temperature, high-humidity, high-dust and high-corrosion environment, and includes the following steps:
s001, providing a light source and a condensation plate capable of generating mirror reflection; in conjunction with fig. 2, the preferred embodiment of the light source 1 is a point light source, and actually the light source 1 usually uses a photodiode as the light source, if the photodiode is used as the light source, the actual shape is not a point light source, a diaphragm 2 can be used to place the photodiode near, and the characteristics of the part of the light passing through the diaphragm 2 tend to be the light emitted by a point light source. And when the diaphragm 2 is closer to the photodiode, the light penetrating through the diaphragm 2 tends to accord with the light-emitting physical characteristics of the point light source.
S002, irradiating the condensation plate with the light source 1 to generate total reflection light, and performing photoelectric conversion on the total reflection light to generate a first electrical signal; step S001, in conjunction with fig. 2, has described the light-emitting physical feature that the light emitted by the photodiode is as close to a point light source as possible through the diaphragm 2. In order to better realize the technical scheme of the step, a parabolic lens 3 is arranged behind an aperture 2, so that light passing through the aperture 2 forms a parallel light beam after passing through the parabolic lens 3, the parallel light beam enters a preset incident light guide pipe 4, a total reflection light guide column 5 is arranged at the tail end of the incident light guide pipe 4, the parallel light beam enters from the rear surface of the total reflection light guide column 5 after passing through the incident light guide pipe 4, first total reflection is generated by one side of the total reflection light guide column 5, then the parallel light beam comes out from the front surface of the total reflection light guide column 5 and irradiates on one surface of the condensation plate 10 capable of generating mirror reflection, one surface of the condensation plate 10 capable of generating mirror reflection is a mirror surface, total reflection is generated on the mirror surface for the second time, the parallel light enters from the front surface of the total reflection light guide column 5 at the moment, and third total reflection is generated by the other side of the total reflection light guide column 5, and finally, the light beam is emitted from the rear surface of the total reflection light guide column 5, and is subjected to photoelectric conversion to generate the first electric signal so as to better receive the total reflection light, so that the total reflection light enters a preset total reflection light guide pipe 6. And a total reflection photoelectric receiver 7 is arranged at the tail end of the total reflection light guide pipe 6, and the total reflection light is received by the total reflection photoelectric receiver 7 and converted into the first electric signal. It should be noted that, before entering the total-reflection photoelectric receiver 7, the total-reflection light is also focused by a parabolic lens 3a, and after focusing is completed, the total-reflection photoelectric receiver 7 enters the total-reflection photoelectric receiver 7, and photoelectric conversion is completed in the total-reflection photoelectric receiver 7, so as to obtain the first electrical signal, and the voltage of the first electrical signal is Vf.
S003, enabling the condensation plate to generate condensation under a high-temperature and high-humidity environment, irradiating the condensation plate through the light source to generate scattered light, and performing photoelectric conversion on the scattered light to generate a second electric signal;
in this embodiment, need carry out humidity detection to the smoke and dust flue gas in the chimney, will combine the condensation board 10 that fig. 2 is shown to stretch into and carry out humidity detection in the chimney, when condensation board 10 got into the chimney, the environment in the chimney was high temperature, high wet and the high corrosive environment of high dust, at first need be in condensation board 10's periphery sets up a ventilative filtration safety cover 11 to filter high dust, it is right to avoid high dust environment condensation board 10 to produce the interference at the condensation in-process, so set up and can avoid the influence of high dust to humidity detection.
In this step, with reference to fig. 2, once the condensation plate 10 enters the chimney, condensation is generated on the mirror surface, and the specific process is as follows: when the condensation plate enters the chimney, the temperature of the condensation plate enters a high-temperature, high-humidity, high-dust and high-corrosion environment in the chimney from normal temperature to form condensation, so that the original point of total reflection of the mirror surface is not totally reflected because the condensation is generated at the moment, and the point is a condensation point at the moment, so that scattering is generated, namely, because the incident point is the condensation point at the moment, incident light forms a scattering phenomenon on the condensation point, and scattered light is generated.
Referring to fig. 2, the second electrical signal is generated by photoelectric conversion for better receiving the scattered light, the scattered light enters from the front surface of the total reflection light guide 5, passes through the middle of the total reflection light guide 5, and exits from the rear surface of the total reflection light guide 5, and then enters into a predetermined scattered light guide 8. A scattered photoelectric receiver 9 is arranged at the tail end of the scattered light guide pipe 8, the scattered light is received by the scattered photoelectric receiver 9 and converted into the second electric signal, it should be noted that before entering the scattered photoelectric receiver 9, the scattered light is focused by a parabolic lens 3b, and after focusing, the scattered light enters the scattered photoelectric receiver 9, photoelectric conversion is completed in the scattered photoelectric receiver 9, so that the second electric signal is obtained, and the voltage of the second electric signal is Vz.
And S004, taking the time when the first electric signal and the second electric signal are received as time points, detecting the temperatures of the condensation plate during condensation and condensation, determining the dew point temperature, detecting the temperatures of the condensation plate during condensation and condensation through a mirror surface temperature sensor 16 arranged on the mirror surface, rapidly reducing the light intensity reflected by the mirror surface when condensation just occurs, and measuring the temperature of the instantaneous condensation surface, namely the dew point temperature. That is, when the voltage Vf of the first electric signal is sharply decreased and the voltage Vz of the second electric signal is sharply increased, the temperature of the mirror surface is the dew point temperature. If the temperature of the mirror surface is higher than the dew point temperature, the mirror surface is not condensed, the light reflection performance of the mirror surface is good, and scattering is not generated; if the temperature of the mirror surface is lower than the dew point temperature, the mirror surface begins to condense, and the mirror surface generates scattering; when the total reflection photoelectric receiver 7 detects the first electric signal, the total reflection photoelectric receiver indicates that the mirror surface generates total reflection, and no condensation is generated on the mirror surface; when the scattered photoelectric receiver 9 detects the second electric signal, it indicates that the mirror surface scatters, and the mirror surface generates condensation.
S005, calculating the humidity of the detected environment according to the dew point temperature and the temperature of the detected environment measured in the step S004;
and S006, repeating the steps S002 to S005 for multiple times to obtain the average value of the measured environmental humidity.
In steps S004 and S005, it is noted that, referring to fig. 2, the mirror surface is provided with a mirror surface temperature sensor 16, and the back side of the mirror surface is provided with an ambient temperature sensor 12. The condensation plate 10 is provided with an ambient temperature sensor 12 and an air blowing cooling pipe 13 for blowing air to the condensation plate 10, the ambient temperature sensor 12 can quickly detect smoke and dust temperature, and the air blowing cooling pipe 13 blows air to the mirror surface to cool the mirror surface and blow dust possibly attached to the mirror surface. When the temperature data detected by the mirror surface temperature sensor 16 is compared with the temperature data of the smoke temperature detected by the environment temperature sensor 12, and the temperature difference between the two is smaller than the condition of generating condensation, the air blowing cooling pipe 13 blows air to the mirror surface to cool the mirror surface.
It should be noted that the provision of the blow cooling pipe 13 is also based on the premise that: once the condensation plate 10 enters the chimney, the smoke and dust flue gas with high temperature, high humidity, high dust and high corrosion in the chimney generates condensation on the mirror surface, the voltage for obtaining the second electric signal is Vz, the condensation on the mirror surface is generated, or the condensation generated initially is volatilized because the temperature of the condensation plate is slowly close to the smoke temperature because the condensation plate 10 enters the chimney for too long time, so that the air blowing cooling pipe 13 can be arranged, the air blowing cooling pipe 13 can be used for air blowing and cooling the mirror surface, and meanwhile, the time point for generating condensation on the mirror surface for many times can be adjusted.
It should be noted that the power source of the cooling air needed by the gas blowing cooling pipes 13 is provided by the air pump 1 and the air pump 2 as shown in fig. 2, and the air pump 1 and the air pump 2 can provide a cooling air source for at least two of the gas blowing cooling pipes 13.
It should be noted that the basic principle of measuring relative humidity by the dew point method is as follows: the dew point temperature Ta is measured and then the saturated partial water vapor pressure Pl corresponding to the dew point temperature Ta is determined. As is apparent, Pl is the water vapor pressure of the air to be measured. Therefore, the relative humidity E of the air can be found by the following equation:
and E is Pl/Pb 100%, Pb is saturated steam pressure, and Pl is obtained by a table look-up mode.
It should be noted that the table look-up method to obtain Pl can be implemented by referring to technical documents, and is not described herein again.
Referring to fig. 2, in order to achieve another object, the present invention provides a technical solution: the utility model provides a humidity detection device under high humidity high dust high corrosion environment of high temperature includes:
the device comprises a light source 1, an incident light guide pipe 4, a total reflection light guide pipe 6, a scattered light guide pipe 8, a condensation plate 10 capable of generating mirror reflection, a total reflection photoelectric receiver 7 and a scattered light photoelectric receiver 9, wherein a mirror surface temperature sensor 16 is arranged on one surface of the condensation plate 10 capable of generating mirror reflection;
when the condensation plate 10 is in a dry state, the light source 1 guides light through the incident light guide pipe 4 and irradiates the condensation plate 10, and generates total reflection light on the condensation plate 10, and the total reflection light is transmitted to the total reflection photoelectric receiver 7 through the total reflection light guide pipe 6 and converted into a first electric signal;
with reference to fig. 2, the light source 1 is preferably a point light source, and actually the light source 1 usually employs a photodiode as the light source, and if the photodiode is used as the light source, the actual shape is not a point light source, a diaphragm 2 can be used to close the photodiode, and the characteristics of the part of the light passing through the diaphragm 2 tend to be the light emitted by a point light source. And when the diaphragm 2 is closer to the photodiode, the light penetrating through the diaphragm tends to accord with the light-emitting physical characteristics of the point light source.
Irradiating the condensation plate by the light source 1 to generate total reflection light, and performing photoelectric conversion on the total reflection light to generate a first electric signal; the physical light-emitting characteristic of the light emitted by the photodiode through the diaphragm 2 as much as possible towards a point source has been described in connection with fig. 2. In order to better realize the technical scheme, a parabolic lens 3 is arranged behind an aperture 2, so that light passing through the aperture 2 forms a parallel light beam after passing through the parabolic lens 3, the parallel light beam enters a preset incident light guide pipe 4, a total reflection light guide column 5 is arranged at the tail end of the incident light guide pipe 4, the parallel light beam enters from the rear surface of the total reflection light guide column 5 after passing through the incident light guide pipe 4, first total reflection is generated by one side of the total reflection light guide column 5, then the parallel light beam comes out from the front surface of the total reflection light guide column 5 and irradiates on one surface of the condensation plate 10 capable of generating mirror reflection, one surface of the condensation plate 10 capable of generating mirror reflection is a mirror surface, total reflection is generated on the mirror surface for the second time, the parallel light enters from the front surface of the total reflection light guide column 5 at the moment, and third total reflection is generated by the other side of the total reflection light guide column 5, and finally, the light beam is emitted from the rear surface of the total reflection light guide column 5, and is subjected to photoelectric conversion to generate the first electric signal so as to better receive the total reflection light, so that the total reflection light enters a preset total reflection light guide pipe 6. And a total reflection photoelectric receiver 7 is arranged at the tail end of the total reflection light guide pipe 6, and the total reflection light is received by the total reflection photoelectric receiver 7 and converted into the first electric signal. It should be noted that, before entering the total-reflection photoelectric receiver 7, the total-reflection light is also focused by a parabolic lens 3a, and after focusing is completed, the total-reflection photoelectric receiver 7 enters the total-reflection photoelectric receiver 7, and photoelectric conversion is completed in the total-reflection photoelectric receiver 7, so as to obtain the first electrical signal, and the voltage of the first electrical signal is Vf.
The condensation plate 10 generates condensation under high temperature and high humidity environment, the light source 1 guides light through the incident light guide pipe 4 and irradiates on a condensation point of the condensation plate 10 to generate scattered light, and the scattered light is transmitted to the scattered light electric receiver 9 through the scattered light guide pipe 8 and converted into a second electric signal;
referring to fig. 2, when humidity detection is performed on smoke dust and smoke of a chimney, once the condensation plate 10 enters the chimney, condensation can be generated on the mirror surface, so that a point of the mirror surface which originally generates total reflection can not generate total reflection because condensation is generated at the moment, and scattering is generated because the point is a condensation point, that is, because the incident point is a condensation point at the moment, incident light forms a scattering phenomenon on the condensation point, and scattering light is generated.
Referring to fig. 2, the second electrical signal is generated by photoelectric conversion for better receiving the scattered light, the scattered light enters from the front surface of the total reflection light guide 5, passes through the middle of the total reflection light guide 5, and exits from the rear surface of the total reflection light guide 5, and then enters into a predetermined scattered light guide 8. A scattered photoelectric receiver 9 is arranged at the tail end of the scattered light guide pipe 8, the scattered light is received by the scattered photoelectric receiver 9 and converted into the second electric signal, it should be noted that before entering the scattered photoelectric receiver 9, the scattered light is focused by a parabolic lens 3b, and after focusing, the scattered light enters the scattered photoelectric receiver 9, photoelectric conversion is completed in the scattered photoelectric receiver 9, so that the second electric signal is obtained, and the voltage of the second electric signal is Vz.
Detecting the temperatures of the condensation plate during condensation and dispersion by taking the time when the first electric signal and the second electric signal are received as time points, and determining the dew point temperature; the temperature of the condensation plate during condensation and the temperature of the condensation plate during condensation are detected through a mirror surface temperature sensor 16 arranged on the mirror surface, the light intensity reflected by the mirror surface is sharply reduced when condensation just occurs, and the temperature of the instantaneous condensation surface is measured, namely the dew point temperature. That is, when the voltage Vf of the first electric signal is sharply decreased and the voltage Vz of the second electric signal is sharply increased, the temperature of the mirror surface is the dew point temperature. If the temperature of the mirror surface is higher than the dew point temperature, the mirror surface is not condensed, the light reflection performance of the mirror surface is good, and scattering is not generated; if the temperature of the mirror surface is lower than the dew point temperature, the mirror surface begins to condense, and the mirror surface generates scattering; when the total reflection photoelectric receiver 7 detects the first electric signal, the total reflection photoelectric receiver indicates that the mirror surface generates total reflection, and no condensation is generated on the mirror surface; when the scattered photoelectric receiver 9 detects the second electrical signal, it indicates that the mirror surface generates scattering, and at this time, the mirror surface generates condensation, and the humidity of the measured environment is calculated according to the measured dew point temperature and the temperature of the measured environment.
By repeating the measurement, the average value of the measured ambient humidity is obtained.
It should be noted that, referring to fig. 2, a mirror surface temperature sensor 16 is disposed on the mirror surface, and an ambient temperature sensor 12 is disposed on the back side of the mirror surface. The condensation plate 10 is provided with an ambient temperature sensor 12 and an air blowing cooling pipe 13 for blowing air to the condensation plate 10, the ambient temperature sensor 12 can quickly detect smoke temperature, and the air blowing cooling pipe 13 blows air to the mirror surface to cool the mirror surface. When the temperature data detected by the mirror surface temperature sensor 16 is compared with the temperature data of the smoke temperature detected by the environment temperature sensor 12, and the temperature difference between the two is smaller than the condition of generating condensation, the air blowing cooling pipe 13 blows air to the mirror surface to cool the mirror surface.
It should be noted that the provision of the blow cooling pipe 13 is also based on the premise that: once the condensation plate 10 enters the chimney, the smoke and dust flue gas with high temperature, high humidity, high dust and high corrosion in the chimney generates condensation on the mirror surface, the voltage for obtaining the second electric signal is Vz, the condensation on the mirror surface is generated, or the condensation generated initially is volatilized because the temperature of the condensation plate is slowly close to the smoke temperature because the condensation plate 10 enters the chimney for too long time, so that the air blowing cooling pipe 13 can be arranged, the air blowing cooling pipe 13 can be used for air blowing and cooling the mirror surface, and meanwhile, the time point for generating condensation on the mirror surface for many times can be adjusted.
It should be noted that the power source of the cooling air needed by the gas blowing cooling pipes 13 is provided by the air pump 1 and the air pump 2 as shown in fig. 2, and the air pump 1 and the air pump 2 can provide a cooling air source for at least two of the gas blowing cooling pipes 13.
It is necessary to provide the heat insulating case 14 on the outside of the condensation plate 10, and the heat insulating case 14 has a very good heat insulating effect against the temperature of the smoke. During detection, the temperature of the mirror surface is adjusted to be lower than the smoke temperature so as to reach the smoke condensation temperature Ta.
It should be noted that the basic principle of measuring relative humidity by the dew point method is as follows: the dew point temperature Ta is measured and then the saturated partial water vapor pressure Pl corresponding to the dew point temperature Ta is determined. As is apparent, Pl is the water vapor pressure of the air to be measured. Therefore, the relative humidity E of the air can be found by the following equation:
and E is Pl/Pb 100%, Pb is saturated steam pressure, and Pl is obtained by a table look-up mode.
It should be noted that the table look-up method to obtain Pl can be implemented by referring to technical documents, and is not described herein again.
In one embodiment, referring to fig. 2, the light source device further includes a tubular housing 15, the incident light pipe 4, the total reflection light pipe 6, and the scattering light pipe 8 are all disposed inside the tubular housing 15, and the condensation plate 10 is disposed at a position facing a front side of the tubular housing 15.
In one embodiment, referring to fig. 2, the condensation plate 10 is externally covered with an air-permeable filtering protective cover 11 for filtering dust. The periphery of condensation board 10 sets up a filtration safety cover 11 that breathes freely to filter high dust, it is right to avoid the high corrosive environment of high dust the interference that condensation board 10 produced at the condensation in-process, so set up and can greatly reduce the high corruption of high dust to the influence that humidity detected.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. As another example, directional relational terms such as left, right, upper, lower, and the like may be used solely to refer to those directions as they appear in the drawings, and do not necessarily require or imply any actual such directional relationships between the entities or operations. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.