CN113504181A - Gas cloud monitoring device and monitoring method based on Fourier infrared spectrum technology - Google Patents
Gas cloud monitoring device and monitoring method based on Fourier infrared spectrum technology Download PDFInfo
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Abstract
The invention discloses a gas cloud monitoring device and a gas cloud monitoring method based on a Fourier infrared spectrum technology, wherein the gas cloud monitoring device comprises a navigation vehicle, a control box and a Fourier infrared analyzer are mounted on the navigation vehicle, an MCU control unit is mounted in the control box, a light source system is arranged in the Fourier infrared analyzer, and the Fourier infrared analyzer is connected with the MCU control unit; the control box is further provided with an infrared camera and a visible light camera, the infrared camera and the visible light camera are respectively connected with the MCU control unit, so that the MCU control unit acquires image information acquired by the infrared camera and the visible light camera and judges whether pollutants exist in corresponding positions according to the image information acquired by the infrared camera and the visible light camera. According to the invention, the infrared image is used for prejudging, and the suspicious polluted gas is determined and then scanned, so that the scanning and detection of unnecessary areas by a Fourier infrared analyzer can be avoided, and the monitoring efficiency is improved.
Description
Technical Field
The invention relates to a monitoring technology for gaseous pollutant leakage and diffusion, in particular to a gas cloud monitoring device and a monitoring method based on a Fourier infrared spectrum technology.
Background
In recent years, although the problem of air pollution has been relieved, with the increasing requirements of various social circles on environmental protection, air monitoring is still an industry which is receiving attention from people. The method can be used for rapidly and accurately predicting the information of the leakage position, the distribution range, the chemical components, the concentration and the like of the gaseous pollutants (gas cloud) in real time, and plays a great role in effectively preventing and treating pipeline leakage and atmospheric pollution. At present, a common means in atmospheric monitoring is gridding fixed-point monitoring, such as an air monitoring station and a CEMS system, although some portable analyzers appear in the market, the detection range, the detection area, the detection timeliness and the like in specific occasions can not completely meet the monitoring requirements, such as urban high-altitude polluted gas cloud monitoring, pipeline leakage monitoring invisible to naked eyes, high-risk pollution source emission monitoring, long-time non-fixed-point continuous monitoring of volatile organic compounds and the like, and monitoring data are concentration values of point positions, so that the three-dimensional information of the whole polluted surface or the polluted area is difficult to obtain. In particular, for some analyzers, only concentration information of the contaminant gas is available, and it is difficult to determine where the source of the contamination is, such as the specific location of a pipeline leak, etc. Although the infrared thermal imager can be used for monitoring the pipeline leakage at present, the equipment can only obtain the position information of the pipeline gas leakage, and the identification capability of multiple components and the concentration thereof is low.
With the development of the spectrum and imaging technology, the technology of combining the spectrum and the imaging provides possibility for realizing long-time and wide-range monitoring of leakage and diffusion of gaseous pollutants. The technologies applied by the mainstream monitoring equipment in the market at present mainly include: although the infrared imaging monitoring technology, the open optical path FTIR spectrum monitoring technology, the infrared imaging and visible light imaging combined technology have advantages, the following problems exist in the face of higher requirements (such as monitoring real-time performance, large range, automatic inspection, data accuracy, lower detection limit and the like) for monitoring gaseous pollutants in the future: firstly, the traditional monitoring equipment cannot have the combined functions of telemetering imaging and open optical path, although the FTIR spectrum monitoring technology of the open optical path is an active monitoring technology, the signal-to-noise ratio and the detection limit are superior to those of the telemetering imaging technology, the FTIR spectrum monitoring technology belongs to fixed point location monitoring, only can monitor the gas concentration on the optical path, has a narrow monitoring surface, is difficult to perform mobile monitoring on the pipeline leakage and the gas distribution condition, and in addition, although the telemetering imaging technology has a wide detection range and can accurately obtain the position of a pollution source, the FTIR spectrum monitoring technology is a passive monitoring technology, has no compensation light source and a low signal-to-noise ratio, and is inferior to the active monitoring technology in the detection accuracy of low-concentration gas components; secondly, the traditional monitoring equipment can only carry out two-dimensional scanning imaging on the gaseous pollutants, three-dimensional scanning imaging is difficult to realize, more useful information can be obtained by the three-dimensional scanning imaging compared with the two-dimensional scanning imaging, such as the distance between the gaseous pollutants and an observer, the three-dimensional size of the gaseous pollutants and the like, the three-dimensional image can more accurately reflect the three-dimensional size of the diffusion of the gaseous pollutants, the actual gas pollution range is obtained, and accurate prevention and control are facilitated; thirdly, the difficulty of periodic self-inspection and calibration of the FTIR analyzer equipment on site is high; fourthly, the traditional monitoring equipment is difficult to autonomously complete cruise monitoring, the equipment needs to be manually installed at a corresponding monitoring position, is inconvenient to move, has poor monitoring timeliness, and is difficult to deal with emergency accidents such as pipeline leakage and the like in time; fifthly, when monitoring, the traditional monitoring equipment needs to scan a target area through a Fourier infrared monitor, the scanning time is long, if no pollutant exists in the target area, the scanning belongs to invalid scanning, and the monitoring efficiency is seriously influenced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a gas cloud monitoring device and a monitoring method based on the Fourier infrared spectrum technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: the gas cloud monitoring device based on the Fourier infrared spectrum technology comprises a navigation vehicle, wherein a control box and a Fourier infrared analyzer are mounted on the navigation vehicle, an MCU control unit is mounted in the control box, a light source system is arranged in the Fourier infrared analyzer, and the Fourier infrared analyzer is connected with the MCU control unit;
the control box is further provided with an infrared camera and a visible light camera, the infrared camera and the visible light camera are respectively connected with the MCU control unit, so that the MCU control unit acquires image information acquired by the infrared camera and the visible light camera, transmits the image information acquired by the infrared camera and the visible light camera to the Fourier infrared analyzer, and judges whether pollutants exist in corresponding positions through the Fourier infrared analyzer.
Optionally, an optical path system is arranged in the fourier infrared analyzer;
the optical path system comprises a receiving telescope, an infrared spectroscope, an interferometer and an infrared detector;
the infrared detector is connected with a control analysis module of the Fourier infrared analyzer, so that infrared spectrum signals acquired by the infrared detector are transmitted to the control analysis module of the Fourier infrared analyzer;
the interferometer is arranged on a preceding stage light path of the infrared detector through the first rotating unit, so that the infrared spectrum is received by the infrared detector after passing through the interferometer; the first rotating unit is connected with a control analysis module of the Fourier infrared analyzer;
the infrared spectroscope is arranged in a light path between the interferometer and the receiving telescope;
the receiving telescope receives infrared light emitted by the gas cloud.
Optionally, the infrared spectroscope is rotatably installed in the optical path system through a second rotating unit, so that the infrared spectroscope can adjust a beam splitting angle in the optical path system; the second rotating unit is connected with a control analysis module of the Fourier infrared analyzer;
the splitting angle of the infrared spectroscope in the optical path system is 0 degree or 45 degrees.
Optionally, the light source system includes an infrared light source, two parabolic reflectors and a rotary diaphragm, the two parabolic reflectors are respectively disposed on two sides of the rotary diaphragm, and the infrared light source and the rotary diaphragm are respectively connected to a control analysis module of the fourier infrared analyzer;
the infrared light emitted by the infrared light source enters the rotary diaphragm after being reflected by the parabolic reflector, and the infrared light passes through the rotary diaphragm and then is reflected to the infrared spectroscope by the other parabolic reflector.
Optionally, a reflecting plate is connected to the outer side of the lens barrel of the receiving telescope, and the inner side surface of the reflecting plate is a reflecting surface;
the reflecting plate is rotationally connected with the outer side of the lens cone of the receiving telescope through a rotating shaft, so that the lens cone of the receiving telescope is opened after the reflecting plate is turned upwards.
Optionally, a hollow reflector is further mounted on the navigation vehicle;
the hollow reflector is a plate body with a hollow cavity structure, and the side surface of one side of the plate body is a reflecting surface.
Optionally, the reflective surface of the hollow reflector is a corrugated surface.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: according to the invention, through infrared image prejudgment, scanning is carried out after suspicious polluted gas is determined, so that scanning detection of unnecessary areas by a Fourier infrared analyzer can be avoided, and thus, the monitoring efficiency is improved.
Based on the gas cloud monitoring device, the invention provides a gas cloud monitoring method based on a Fourier infrared spectrum technology, which comprises the following steps,
the navigation vehicle moves to the current monitoring point;
acquiring gas cloud background image information of a monitoring point position through a visible light camera, starting an infrared camera to acquire the infrared image information of the gas cloud if the visible light camera acquires the gas cloud background image information, and moving the navigation vehicle to the next monitoring point if the gas cloud background image information is not acquired;
after the infrared image information of the gas cloud is obtained, the Fourier infrared analyzer scans the gas cloud, obtains an infrared light signal of the gas cloud, and monitors chemical components, concentration, distance and position information of the gas cloud.
Optionally, before monitoring the gas cloud, the gas cloud monitoring device is self-checked, wherein the self-checking step of the gas transportation monitoring device is as follows:
adjusting the splitting angle of the infrared spectroscope by a control analysis module of a Fourier infrared analyzer to enable the splitting angle of the infrared spectroscope to be 45 degrees;
turning over the reflecting plate to enable the reflecting surface of the reflecting plate to be coaxial with the lens cone of the receiving telescope;
starting the infrared light source through a control analysis module of the Fourier infrared analyzer, so that infrared light emitted by the infrared light source sequentially passes through the parabolic reflector, the through hole of the rotary diaphragm, the other parabolic reflector and the infrared spectroscope; the infrared light reaches the infrared spectroscope and is divided into two beams of infrared light, wherein one beam of infrared light is transmitted from the infrared spectroscope, the other beam of infrared light is reflected to the reflecting plate by the infrared spectroscope, the infrared light reaching the reflecting plate returns in the original path under the reflection action of the reflecting plate and is divided into two beams of infrared light by the infrared spectroscope again, and the infrared light transmitted by the infrared spectroscope again is emitted to the interferometer;
and adjusting the interferometer through a control analysis module of the Fourier infrared analyzer to enable interference light formed after the interference action of the interferometer to be received by the infrared detector, so as to finish calibration.
Optionally, after the calibration is completed, the control analysis module of the fourier infrared analyzer adjusts the splitting angle of the infrared spectroscope to make the splitting angle of the infrared spectroscope 0 °, and turns over the reflection plate upward to open the lens barrel of the receiving telescope.
Correspondingly, by adopting the gas cloud monitoring method, prejudgment can be performed through the infrared image, and scanning can be performed after the suspicious polluted gas is determined, so that scanning and detection of unnecessary areas by a Fourier infrared analyzer can be avoided, and the monitoring efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of a navigation vehicle of the present invention;
FIG. 2 is a schematic diagram of the optical path of the light source system in a telemetry imaging monitoring mode of the present invention;
fig. 3 is a schematic diagram of the optical path of the light source system in the open optical path monitoring mode according to the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the invention discloses a gas cloud monitoring device based on a fourier infrared spectroscopy technology, which comprises a navigation vehicle 15, wherein the navigation vehicle 15 is used for moving and navigating the whole gas cloud monitoring device, a control box 23 and a fourier infrared analyzer 9 are installed on the navigation vehicle 15, an MCU control unit is installed in the control box 23, a light source system is arranged in the fourier infrared analyzer 9, and the fourier infrared analyzer 9 is connected with the MCU control unit. In the invention, the fourier infrared analyzer 9 is specifically installed on the top of the control box 23 through the horizontal rotating table 5 and the elevation angle adjusting table 6, and both the horizontal rotating table 5 and the elevation angle adjusting table 6 are connected with the MCU control unit, so that the fourier infrared analyzer 9 controls the infrared receiving angle of the fourier infrared analyzer 9 through the horizontal rotating table 5 and the elevation angle adjusting table 6 under the control of the MCU control unit.
In the present invention, an optical path system is further built in the fourier infrared analyzer 9, and the optical path system is shown in fig. 2 and 3. Wherein, a receiving telescope 7, an infrared spectroscope 17, an interferometer 18 and an infrared detector 19 are arranged in an optical path system of the Fourier transform infrared analyzer, and the infrared detector 19 is connected with a control analysis module of the Fourier transform infrared analyzer 9. The receiving telescope 7 receives an infrared light beam 16 from the cloud, the infrared light beam 16 passes through the receiving telescope 7 and sequentially passes through an infrared spectroscope 17 and an interferometer 18, the infrared light beam 16 forms interference light through the interferometer 18 and then is detected by an infrared detector 19, and the infrared detector 19 transmits a detected interference light signal to a control analysis module of the Fourier infrared analyzer 9.
In the present invention, the interferometer 18 is installed in the front stage optical path of the infrared detector 19 through a first rotating unit, the first rotating unit is connected with the control analysis module of the fourier infrared analyzer 9, the deflection angle of the first rotating unit is controlled through the control analysis module of the fourier infrared analyzer 9, and further the incident angle of the incident light of the interferometer 18 is controlled, thereby realizing the adjustment of the precision. The interferometer 18 adopts a swing angle mirror type interferometer, which can reduce the adverse effect of the inclination of the movable mirror on the interference efficiency and improve the system stability.
The infrared spectroscope 17 is rotatably installed in the optical path system through the second rotating unit, so that the beam splitting angle of the infrared spectroscope 17 can be adjusted in the optical path system, the second rotating unit is connected with the control analysis module of the Fourier infrared analyzer 9, the deflection angle of the second rotating unit is controlled through the control analysis module of the Fourier infrared analyzer 9, and the purpose of controlling the beam splitting angle of the infrared spectroscope 17 is achieved. The splitting angle of the infrared beam splitter 17 in the optical path system is 0 ° or 45 °.
In the invention, the light source system can be used for self-checking and calibrating the gas cloud monitoring device. Specifically, the light source system includes an infrared light source 21, two parabolic reflectors 22, a rotary diaphragm 20, the two parabolic reflectors 22 are respectively disposed on two sides of the rotary diaphragm 20, the infrared light source 21 and the rotary diaphragm 20 are respectively connected with a control analysis module of the fourier infrared analyzer 9, the control analysis module of the fourier infrared analyzer 9 controls the on-off state of the infrared light source 21, and the control analysis module of the fourier infrared analyzer 9 controls the diaphragm through hole of the rotary diaphragm 20. In the present invention, the rotary diaphragm 20 is provided with two diaphragm through holes, wherein one diaphragm through hole is provided with a standard reference material (such as polystyrene) pressing sheet, and the other diaphragm through hole is a hollow through hole. The outer side of the lens cone of the receiving telescope 7 is connected with a reflecting plate 8, the inner side surface of the reflecting plate 8 is a reflecting surface, and the reflecting surface adopts a gold-plated plane to prevent infrared light from being absorbed by the reflecting plate 8.
During calibration, infrared light emitted by an infrared light source 21 enters a diaphragm through hole with a standard reference substance pressing sheet in a rotary diaphragm 20 after being reflected by a parabolic reflector 22, the infrared light passes through the rotary diaphragm 20 and then is reflected to an infrared spectroscope 17 by another parabolic reflector 22, the infrared spectroscope 17 divides the infrared light into a reflected light beam and a transmitted light beam, wherein the reflected light beam is emitted to a reflecting plate 8 and returns back in the original way under the action of a reflecting surface of the reflecting plate 8, and is divided into another reflected light beam and another transmitted light beam again by the infrared spectroscope 17, the transmitted light beam passing through the infrared spectroscope 17 again is emitted to an interferometer 18 under the action of another reflector to form interference light, and finally the interference light is emitted to an infrared detector 19 and is captured by the infrared detector 19.
In the invention, the reflecting plate 8 is rotatably connected with the outer side of the lens barrel of the receiving telescope 7 through the rotating shaft, so that the lens barrel of the receiving telescope 7 is opened after the reflecting plate 8 is turned upwards, and the lens barrel of the receiving telescope 7 is closed after the reflecting plate 8 is turned downwards. In the monitoring state, the reflecting plate 8 is in the upturned state to open the receiving telescope 7, and in the calibration state, the reflecting plate 8 is in the downturned state, at which time the reflecting plate 8 closes the receiving telescope 7.
In the invention, the control box 23 is also provided with the infrared camera 3 and the visible light camera 4, the infrared camera 3 and the visible light camera 4 are respectively connected with the MCU control unit, so that the MCU control unit acquires image information acquired by the infrared camera 3 and the visible light camera 4, transmits the image information acquired by the infrared camera 3 and the visible light camera 4 to the Fourier infrared analyzer 9, and judges whether pollutants exist in corresponding positions through the Fourier infrared analyzer 9.
In the invention, the top of the navigation vehicle 15 is also provided with a solar panel 11 and a navigation column 10, the solar panel 11 can supply power for the Fourier infrared analyzer 9 and the control box 23, and the navigation column 10 can be used for receiving navigation information of a remote control system so as to facilitate navigation and positioning of the traveling direction of the navigation vehicle 15. Still be equipped with power source 14 on control box 23, power source 14 is used for the power supply of navigation 15 static monitoring time, through external power cord power supply, also charges for inside battery, the long term removal monitoring of being convenient for.
In the present invention, the control box 23 may be mounted on the navigation car 15 through another rotating platform so as to realize 360 ° rotation of the infrared camera 3 and the visible light camera 4.
In the present invention, the hollow reflector 12 is further mounted on the navigation car 15, and the back of the hollow reflector 12 is provided with the support plate 13. The hollow reflector 12 is placed directly on the navigation car 15 so that, in use, the hollow reflector 12 is removed directly from the navigation car 15.
Specifically, the hollow reflector 12 is a plate body having a hollow cavity structure, one side surface of the plate body is a reflecting surface, and the reflecting surface is a corrugated surface.
The gas cloud monitoring device based on the invention has two monitoring modes, namely a telemetering imaging monitoring mode and an open light path monitoring mode, and the telemetering imaging monitoring mode can be divided into a two-dimensional imaging mode and a three-dimensional imaging mode. The two-dimensional imaging mode and the three-dimensional imaging mode are both passive gas cloud monitoring, an infrared light source 21 is not needed, the gas cloud monitoring device directly receives infrared radiation light from the gas cloud, and three-dimensional or two-dimensional chemical imaging can be carried out on the gas cloud. The open optical path monitoring mode is active monitoring, an infrared light source 21 needs to be provided, the gas cloud monitoring device receives reflected light of the hollow reflector 12, and the concentration of gaseous pollutants can be monitored in real time.
In the invention, the white light source 1 is also arranged on the control box 23, the white light source 1 can provide illumination for the navigation vehicle 15 during night monitoring, so that obstacles can be avoided conveniently, light source compensation can be provided for the detection of the visible light camera 4, and the visible light camera 4 can obtain a clear background image conveniently. In addition, still can install laser light source 2 on control box 23, laser light source 2 mainly used is supplementary when open light path monitoring mode, posture adjustment is made to hollow reflector 12, because the light that laser light source 2 sent is visible light, and infrared light is invisible light, consequently, through laser light source 2, hollow reflector 12 can let parallel incidence's laser light return on the way, at this in-process, the reflection condition of the light path can be observed clearly to naked eye, therefore the regulation work of the light path of being convenient for, realize convenient, quick, accurately adjust the light path.
In the invention, the infrared camera 3 is used for collecting the heat radiation image of the gas cloud, can obtain the two-dimensional profile map of the gas cloud, can image in the daytime or at night, and has great advantages because the gas cloud as the gaseous pollutant is invisible to naked eyes; the visible light camera 4 is used for imaging the gas cloud background in real time and recording the background image of the gas cloud, so that the position where the gas cloud appears can be determined, and subsequent prevention and treatment are facilitated.
When monitoring the gas cloud, the monitoring is realized by the following steps:
s1, remotely controlling the navigation vehicle 15 to move to a monitoring point needing monitoring currently through the navigation column 10;
and S2, when the navigation vehicle 15 reaches the designated position, acquiring the background image information of the gas cloud at the monitoring point position through the visible light camera 4 so as to acquire the position of the gas cloud.
And if the visible light camera 4 acquires the cloud background image information, starting the infrared camera 3 to acquire the infrared image information of the cloud.
If the visible light camera 4 fails to acquire the cloud background image information, the navigation vehicle 15 moves to the next monitoring point to prepare for monitoring of the next monitoring point.
And S3, after the infrared camera 3 acquires the infrared image information of the gas cloud, the Fourier infrared analyzer 9 scans the gas cloud to acquire an infrared light signal of the gas cloud, and accurately monitors the chemical components, the concentration, the distance and the position information of the gas cloud.
Of course, the monitoring steps described above are for a telemetry imaging monitoring mode in a two-dimensional imaging mode. When a three-dimensional imaging mode is required, a plurality of navigation vehicles 15 need to be prepared, and the gas cloud is monitored from different positions through the plurality of navigation vehicles 15, so that three-dimensional gas cloud information can be obtained. Compared with the telemetering imaging monitoring mode in the two-dimensional imaging mode, the telemetering imaging monitoring mode in the three-dimensional imaging mode reflects the size of gas cloud more truly. In a telemetering imaging monitoring mode in a three-dimensional imaging mode, an included angle between the navigation vehicle 15 and the air cloud is kept between 10 and 170 degrees.
In the invention, the remote-measuring imaging monitoring mode is used for monitoring gas clouds generated by pipeline leakage, air gas clouds and gas clouds emitted by pollution sources so as to rapidly monitor, qualitatively and quantitatively determine the gas clouds. The open optical path monitoring mode is mainly used for continuously monitoring a specific position for a long time, for example, in the leakage monitoring of a pipeline, the leakage position, the leakage gas component, the concentration and the concentration change of the pipeline can be accurately monitored. The open optical path monitoring mode has higher signal-to-noise ratio compared with the telemetering imaging monitoring mode.
In the open optical path monitoring mode, the monitoring steps are as follows:
s1, the navigation vehicle 15 moves to a specified position near the leakage pipeline.
And S2, acquiring background image information of the gas cloud leaked from the pipeline through the visible light camera 4 to acquire the position of the gas cloud.
And if the visible light camera 4 acquires the cloud background image information, starting the infrared camera 3 to acquire the infrared image information of the cloud.
If the visible light camera 4 fails to acquire the cloud background image information, the navigation vehicle 15 moves to another adjacent position for monitoring.
And S3, after the visible light camera 4 acquires the air cloud background image information, taking down the hollow reflector 12 from the navigation vehicle 15, and respectively placing the navigation vehicle 15 and the hollow reflector 12 at two sides of the leakage pipeline.
S4, after the infrared camera 3 acquires the infrared image information of the gas cloud, the Fourier infrared analyzer 9 is started to scan the gas cloud leaked from the pipeline, meanwhile, the infrared light source 21 is turned on, the light splitting angle of the infrared spectroscope 17 is rotated to 45 degrees, at this time, 50% of energy from the infrared light source 21 is reflected out by the infrared spectroscope 17, and 50% of incident light from the hollow reflector 12 is transmitted, so that the function of continuous monitoring is realized.
And S5, after receiving the infrared signal of the gas cloud, the Fourier infrared analyzer 9 fuses the infrared spectrum with the gas cloud background image information acquired by the visible light camera 4 and the infrared image information acquired by the infrared camera 3 to obtain the chemical image information of the gas cloud and draw a corresponding concentration map.
It should be noted that the standard infrared spectrums of various elements are already stored in the fourier infrared analyzer 9, so that after the fourier infrared analyzer 9 receives the infrared signal of the gas cloud, the chemical components of the gas cloud can be obtained by comparing the infrared signal with the standard infrared spectrums.
In the invention, before monitoring the gas cloud, the gas cloud monitoring device needs to be self-checked, and the self-checking step is as follows:
s1, adjusting the splitting angle of the infrared beam splitter 17 through the MCU control unit to enable the splitting angle of the infrared beam splitter 17 to be 45 degrees;
s2, turning over the reflecting plate 8 to enable the reflecting surface of the reflecting plate 8 to be coaxial with the lens barrel of the receiving telescope 7;
s3, the MCU control unit starts the infrared light source 21, so that the infrared light emitted by the infrared light source 21 passes through the parabolic reflector 22, the through hole of the rotary diaphragm 20, the other parabolic reflector 22 and the infrared spectroscope 17 in sequence.
Wherein, after the infrared light reaches the infrared spectroscope 17, the infrared light is divided into two beams of infrared light, wherein, one beam of infrared light is transmitted through the infrared spectroscope 17, the other beam of infrared light is reflected to the reflecting plate 8 by the infrared spectroscope 17, the infrared light reaching the reflecting plate 8 returns in the original way under the reflection action of the reflecting plate 8, and is divided into two beams of infrared light by the infrared spectroscope 17 again, the infrared light transmitted by the infrared spectroscope 17 again is emitted to the interferometer 18;
and S4, adjusting the interferometer 18 through the MCU control unit, so that interference light formed after the interference action of the interferometer 18 is received by the infrared detector 19, and completing calibration.
It should be noted that the rotary diaphragm 20 of the present invention is provided with two diaphragm through holes, wherein one diaphragm through hole is provided with a standard reference object (e.g. polystyrene) pressing sheet, and the other diaphragm through hole is a hollow through hole, during calibration, the diaphragm through hole provided with the standard reference object is aligned to the infrared light emitted by the infrared light source 21, and simultaneously, the splitting angle of the infrared beam splitter 17 is adjusted to 45 °. After the calibration is completed, the diaphragm through-holes of the holes are aligned with the infrared light of the infrared light source 21, and at the same time, the spectroscopic angle of the infrared spectroscope 17 is adjusted to 0 °. In the telemetering imaging monitoring mode, the splitting angle of the infrared spectroscope 17 is kept at 0 °, and the infrared light source 21 is turned off, and in the open light path monitoring mode, the splitting angle of the infrared spectroscope 17 is adjusted to 45 °, and the infrared light source 21 is turned on, and an empty diaphragm through hole is kept to be aligned with infrared light emitted by the infrared light source 21.
After the calibration is finished, the MCU control unit adjusts the light splitting angle of the infrared spectroscope to enable the light splitting angle of the infrared spectroscope to be 0 degree, the reflecting plate is turned upwards, and the lens cone of the receiving telescope is opened.
In addition, during the calibration operation in the open optical path monitoring mode, the laser light source 2 is required to assist the calibration operation. During calibration, the laser source 2 emits laser, the laser is reflected by the hollow reflector 12 after passing through the gas cloud, if the reflected laser returns according to the original path, the calibration is considered to be completed, if the reflected laser does not return according to the original path, the horizontal turntable positioned below the control box 23 is adjusted, and the incidence direction of the laser source 2 is adjusted until the reflected laser returns according to the original path.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.
Claims (10)
1. The gas cloud monitoring device based on the Fourier infrared spectrum technology is characterized by comprising a navigation vehicle, wherein a control box and a Fourier infrared analyzer are mounted on the navigation vehicle, an MCU control unit is mounted in the control box, a light source system is arranged in the Fourier infrared analyzer, and the Fourier infrared analyzer is connected with the MCU control unit;
the control box is further provided with an infrared camera and a visible light camera, the infrared camera and the visible light camera are respectively connected with the MCU control unit, so that the MCU control unit acquires image information acquired by the infrared camera and the visible light camera, transmits the image information acquired by the infrared camera and the visible light camera to the Fourier infrared analyzer, and judges whether pollutants exist in corresponding positions through the Fourier infrared analyzer.
2. The gas cloud monitoring device based on Fourier infrared spectroscopy of claim 1, wherein the Fourier infrared analyzer is internally provided with an optical path system;
the optical path system comprises a receiving telescope, an infrared spectroscope, an interferometer and an infrared detector;
the infrared detector is connected with a control analysis module of the Fourier infrared analyzer, so that infrared spectrum signals acquired by the infrared detector are transmitted to the control analysis module of the Fourier infrared analyzer;
the interferometer is arranged on a preceding stage light path of the infrared detector through the first rotating unit, so that the infrared spectrum is received by the infrared detector after passing through the interferometer; the first rotating unit is connected with a control analysis module of the Fourier infrared analyzer;
the infrared spectroscope is arranged in a light path between the interferometer and the receiving telescope;
the receiving telescope receives infrared light emitted by the gas cloud.
3. The gas cloud monitoring device based on the fourier infrared spectroscopy technology as claimed in claim 2, wherein the infrared spectroscope is rotatably installed in the optical path system through a second rotating unit, so that the infrared spectroscope can adjust a light splitting angle in the optical path system; the second rotating unit is connected with a control analysis module of the Fourier infrared analyzer;
the splitting angle of the infrared spectroscope in the optical path system is 0 degree or 45 degrees.
4. The gas cloud monitoring device based on the Fourier infrared spectroscopy technology as claimed in claim 3, wherein the light source system comprises an infrared light source, two parabolic reflectors and a rotary diaphragm, the two parabolic reflectors are respectively arranged at two sides of the rotary diaphragm, and the infrared light source and the rotary diaphragm are respectively connected with a control analysis module of the Fourier infrared analyzer;
the infrared light emitted by the infrared light source enters the rotary diaphragm after being reflected by the parabolic reflector, and the infrared light passes through the rotary diaphragm and then is reflected to the infrared spectroscope by the other parabolic reflector.
5. The gas cloud monitoring device based on the Fourier infrared spectroscopy technology as claimed in claim 4, wherein a reflecting plate is connected to the outer side of the lens barrel of the receiving telescope, and the inner side surface of the reflecting plate is a reflecting surface;
the reflecting plate is rotationally connected with the outer side of the lens cone of the receiving telescope through a rotating shaft, so that the lens cone of the receiving telescope is opened after the reflecting plate is turned upwards.
6. The device for monitoring the cloud of gases based on the Fourier infrared spectroscopy technology of claim 5, wherein the navigation vehicle is further provided with a hollow reflector;
the hollow reflector is a plate body with a hollow cavity structure, and the side surface of one side of the plate body is a reflecting surface.
7. A gas cloud monitoring device according to claim 6, characterised in that the reflective surface of the hollow reflector is corrugated.
8. A gas cloud monitoring method based on Fourier infrared spectrum technology is characterized by comprising the following steps,
the navigation vehicle moves to the current monitoring point;
acquiring gas cloud background image information of a monitoring point position through a visible light camera, starting an infrared camera to acquire the infrared image information of the gas cloud if the visible light camera acquires the gas cloud background image information, and moving the navigation vehicle to the next monitoring point if the gas cloud background image information is not acquired;
after the infrared image information of the gas cloud is obtained, the Fourier infrared analyzer scans the gas cloud, obtains an infrared light signal of the gas cloud, and monitors chemical components, concentration, distance and position information of the gas cloud.
9. The method for monitoring the gas cloud based on the Fourier infrared spectrum technology as recited in claim 8, wherein the gas cloud monitoring device is self-checked before the gas cloud is monitored, and the self-checking step of the gas transportation monitoring device comprises the following steps:
adjusting the splitting angle of the infrared spectroscope by a control analysis module of a Fourier infrared analyzer to enable the splitting angle of the infrared spectroscope to be 45 degrees;
turning over the reflecting plate to enable the reflecting surface of the reflecting plate to be coaxial with the lens cone of the receiving telescope;
starting the infrared light source through a control analysis module of the Fourier infrared analyzer, so that infrared light emitted by the infrared light source sequentially passes through the parabolic reflector, the through hole of the rotary diaphragm, the other parabolic reflector and the infrared spectroscope; the infrared light reaches the infrared spectroscope and is divided into two beams of infrared light, wherein one beam of infrared light is transmitted from the infrared spectroscope, the other beam of infrared light is reflected to the reflecting plate by the infrared spectroscope, the infrared light reaching the reflecting plate returns in the original path under the reflection action of the reflecting plate and is divided into two beams of infrared light by the infrared spectroscope again, and the infrared light transmitted by the infrared spectroscope again is emitted to the interferometer;
and adjusting the interferometer through a control analysis module of the Fourier infrared analyzer to enable interference light formed after the interference action of the interferometer to be received by the infrared detector, so as to finish calibration.
10. The method according to claim 9, wherein after the calibration is completed, the control and analysis module of the fourier infrared analyzer adjusts the splitting angle of the infrared spectroscope to 0 ° and turns the reflection plate upward to open the barrel of the receiving telescope.
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