CN116465830A - NO (NO) 2 Imaging detector light path system - Google Patents
NO (NO) 2 Imaging detector light path system Download PDFInfo
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- CN116465830A CN116465830A CN202310471991.0A CN202310471991A CN116465830A CN 116465830 A CN116465830 A CN 116465830A CN 202310471991 A CN202310471991 A CN 202310471991A CN 116465830 A CN116465830 A CN 116465830A
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- imaging detector
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- 238000003384 imaging method Methods 0.000 title claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000012937 correction Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000002834 transmittance Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000012800 visualization Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 37
- 238000010521 absorption reaction Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000003705 background correction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses an optical path system of an NO2 imaging detector, which is an optical mechanical system for realizing visual remote measurement of the discharge or leakage position and condition of polluted gas by utilizing parallel non-dispersive imaging of a beam splitter in a visible wave band. The detector light path imaging system comprises four sub light paths, no moving parts are arranged in the light paths, the imaging speed is high, and the operation is reliable. Imaging measurement, emission source image positioning and error correction are simultaneously carried out by sharing the front light path, so that the volume and weight of the system are reduced, and subsequent image processing and concentration calculation are facilitated. Has the advantages of visualization, high space-time resolution, low cost and the like.
Description
Technical Field
The invention belongs to the technical field of optical telemetry and correction, and particularly relates to an optical path system of an NO2 imaging detector, which is used for receiving solar scattered radiation through a telescope, splitting the solar scattered radiation and transmitting the solar scattered radiation to a subsequent camera imaging detection mechanism.
Background
In order to solve the problem of environmental air pollution, the information about the air pollution in the area needs to be accurately and timely obtained. NO (NO) 2 The problem of pollution gas monitoring is an important part of the treatment of atmospheric pollution. NO (NO) 2 The imaging detector is used for acquiring NO by detecting visible light radiation penetrating through the gas 2 The gas two-dimensional distribution diagram meets the requirements of analyzing the pollution emission and the change condition, eliminates or corrects the interference of other gases, and reduces the measurement error caused by the light path. The key technology is a variable field of view and high time resolution imaging technology. The optical system is required to have both good spatial dimension imaging quality and imaging speed to achieve the required spatial and temporal resolution. It is also necessary to have positioning and correction optical paths and meet the size, weight, structure, cost and reliability requirements of the system.
NO 2 Concentration gradient changes of the polluted gas emission often have the characteristics of small space range and high speed,making monitoring difficult. While the conventional point source monitoring is difficult to meet the requirement of observing dynamic changes, the conventional optical telemetry systems have the defects of relatively complex measuring light path, relatively large volume, relatively high price, relatively low time resolution and the like.
Disclosure of Invention
Emission of NO for pollution sources 2 The invention provides an NO, which is an urgent requirement for rapid imaging, positioning and monitoring of atmospheric pollutants, realizes high-time-resolution full-range imaging of emission distribution of pollution source smoke plume and the like 2 The imaging detector optical path system can receive solar scattered light radiation through the telescope, and can realize optical and mechanical systems of four sub-optical path imaging simultaneously through beam splitting, so that the problems of overlarge system volume, complex structure, high cost and low time resolution in the prior art are solved.
In order to solve the problems, the scheme of the invention is as follows:
NO (NO) 2 An imaging detector optical path system, the imaging detector system comprising: main light path: a solar scattered light incident light path; two branch light paths: positioning a correction light path and a measurement light path; four sub-optical paths: positioning a detection light path, a correction measurement light path, a first sub-measurement light path and a second sub-measurement light path;
the solar scattered light incident main light path is a telescopic, collimating and beam splitting light path, and a telescopic collimating lens group, an emergent diaphragm and a first beam splitting lens are sequentially arranged on the main light path; the positioning correction optical path is provided with a second beam splitter; the measuring light path is provided with a first filter and a third beam splitter; the positioning detection light path is provided with a first camera; the correction measuring light path is provided with a second optical filter, a third gas pool unit and a second camera; the first sub-measuring light path is provided with a first gas pool unit and a third camera; the second sub-measuring light path is provided with a second gas pool unit and a fourth camera;
the solar scattered light of the target area enters the imaging detector system through the telescopic collimating lens group, and is collimated and then enters the first beam splitter through the emergent diaphragm to be split into two different light beams: one beam of light enters the positioning correction light path and is divided into two beams after passing through a second beam splitter: one beam of light reaches the first camera to be imaged, and the other beam of light passes through the second filter and the third gas pool unit and then is imaged on the second camera; the other beam of light emitted from the first beam splitter enters the measuring light path, passes through the first filter, reaches the third beam splitter, and is split into two beams of light again: one beam passes through the first gas cell unit and is imaged on the third camera, and the other beam passes through the second gas cell unit and is finally imaged on the fourth camera.
Further, the telescopic collimating lens group consists of a plurality of spherical lenses and an aspheric lens, the focal length of the telescopic collimating lens group is adjustable, the aperture of a diaphragm of the emergent diaphragm is adjustable, the first beam splitter is a flat beam splitter, and the beam splitting ratio of the first beam splitter is 50:50.
Further, the second beam splitter is a flat beam splitter, and the beam splitting ratio is 50:50.
Further, the first filter is a bandpass filter, the center wavelength is 436nm, the half-width is 10nm, the cut-off frequency is 426nm and 446nm, the transmittance is more than 85% in the range of 433-439nm, and the third beam splitter 6 is a flat beam splitter with the splitting ratio of 50:50.
Further, the second filter is a bandpass filter, the center wavelength is 600nm, the half width is 10nm, the third gas pool unit is a quartz glass pool, the interior is vacuumized, and the second camera is a monochromatic CMOS camera.
Further, the first gas tank unit is a quartz glass tank, and NO is sealed inside the first gas tank unit 2 Gas, and NO 2 The gas concentration is greater than 1X 10 18 molec/cm 2 The third camera is a monochromatic CMOS camera.
Further, the second gas pool unit is a quartz glass pool, the interior of the second gas pool unit is vacuumized, and the fourth camera is a monochromatic CMOS camera.
Further, the first camera is a color CMOS camera.
Further, the positioning detection light path and the correction measuring light path share a front positioning correction light path, the first sub-measuring light path and the second sub-measuring light path share a front measuring light path, and the positioning correction light path and the measuring light path share a forefront solar scattered light incident light path.
According to the technical scheme, the four sub-optical-path imaging is realized through the three beam splitters at the same time, wherein the positioning detection optical path can be used for positioning NO through the image and combining the measuring optical path result 2 The positions are distributed, and local amplified focus detection is carried out according to the azimuth; the image obtained by correcting the measuring light path can be used for correcting and eliminating the interference influence of smoke dust and water vapor; the image measured by the first sub-measuring light path and the second sub-measuring light path are combined to calculate the target area NO 2 Concentration and distribution and to accomplish flat field correction. The cameras all adopt high-speed CMOS cameras, and have high time resolution, better economy, adjustable integration time, short response time and high signal-to-noise ratio.
The invention has the beneficial effects that:
1. the three beam splitters are utilized to simultaneously realize four sub-optical path imaging, thereby meeting the requirements of visually monitoring the discharge or leakage position and discharge condition of the polluted gas. The fixed optical device is adopted, no movable part exists, the anti-interference capability is strong, and the reliability is improved.
2. The beam splitters and the optical filters are added in the optical path, so that the optical path sharing can be realized by measuring, positioning and correcting the optical path, the number of parts is reduced, the system structure is simplified, the whole volume and the whole weight are reduced, the imaging measurement, the positioning of the emission source image and the error correction can be simultaneously realized, and the additional image registration is not needed in the later stage.
3. No dispersive element, high radiation energy utilization rate and good imaging quality. The high-speed CMOS detection device is adopted for imaging, and the time resolution and the signal to noise ratio are ensured. The system has lower overall cost and good economical efficiency.
Drawings
FIG. 1 is a diagram of NO according to the present invention 2 Imaging detector optical path system component and optical path diagram.
Detailed Description
Referring to FIG. 1, a lightweight, low cost, high time resolution NO 2 Imaging detector optical path system is provided with multichannel imaging measurement optical system, includes:
main light path: a solar scattered light incident light path A;
two branch light paths: positioning a correction light path B and a measurement light path C;
four sub-optical paths: positioning a detection light path D, a correction measurement light path E, a first sub-measurement light path F and a second sub-measurement light path G;
the solar scattered light incidence main light path A is a telescopic, collimating and beam splitting light path, and a telescopic collimating lens group 1, an emergent diaphragm 2 and a first beam splitting lens 3 are sequentially arranged on the main light path A;
the positioning correction light path B is provided with a second beam splitter 4;
the measuring light path C is provided with a first optical filter 5 and a third beam splitter 6;
the positioning detection light path D is provided with a first camera 7;
the correction measuring light path E is provided with a second optical filter 8, a third gas pool unit 9 and a second camera 10;
the first sub-measuring light path F is provided with a first gas pool unit 11 and a third camera 12;
the second sub-measuring light path G is provided with a second gas pool unit 13 and a fourth camera 14;
the solar scattered light in the target area enters the imaging detector system through the telescopic collimating lens group 1, and is collimated and then enters the first beam splitter 3 through the emergent diaphragm 2 to be split into two different light beams: one beam of light enters the positioning correction light path B and is divided into two beams after passing through the second beam splitter 4: one beam of light reaches the first camera 7 to be imaged, and the other beam passes through the second filter 8 and the third gas cell unit 9 to be imaged on the second camera 10; wherein the color image of the light beam after incidence on the first camera 7 can be provided to the observer in the field of the target area, and then according to NO 2 The detection result is used for adjusting the size of the field of view, and the pollution occurrence position is amplified for key measurement. Said firstThe two filters 8 are narrow-band filters, the incident light is filtered by the second filter 8, the transmitted light of the wave band reaches the second camera 10, and the formed image can be used for removing smoke dust, water vapor and the like to NO 2 Interference effects of the measurements. The other beam of light emitted from the first beam splitter 3 enters the measuring light path C, passes through the first filter 5, reaches the third beam splitter 6, and is split into two beams of light again: one beam passes through the first gas cell unit 11 and is imaged on the third camera 12, and the other beam passes through the second gas cell unit 13 and is finally imaged on the fourth camera 14. Wherein the first optical filter 5 is a narrow-band optical filter, the first gas cell unit 11 is a quartz glass cell, and NO is sealed inside 2 The second gas cell unit 13 is a quartz glass cell, the interior is vacuumized, after being filtered by the first filter 5, the transmitted light passing through the second gas cell unit 13 is compared with the transmitted light passing through the first gas cell unit 11, and the NO in the atmosphere of the target area can be deduced 2 Gas concentration.
The positioning detection light path D and the correction measuring light path E share a front positioning correction light path B, the first sub-measuring light path F and the second sub-measuring light path G share a front measuring light path C, and the positioning correction light path B and the measuring light path C share a forefront solar scattered light incident light path A.
Four sub-optical path imaging is realized simultaneously through three beam splitters.
The image measured by the first sub-measuring light path and the second sub-measuring light path are combined to calculate the target area NO 2 Concentration and distribution and to accomplish flat field correction. The method is characterized in that a polluted area and a clean air background beside the polluted area are respectively imaged, the measurement principle is based on the lambert-beer absorption law, when light passes through the air, the light can be absorbed by the air in the air, so that the light intensity of a certain wave band is weakened, the transmitted light intensity and the absorbance accord with the lambert-beer law, and the concentration of a certain air in the air can be measured according to the degree of light intensity reduction in a certain wave band. Screening out NO using an optical filter 2 Band with strong absorption and relatively weak absorption of other gases is provided with I 1 I are respectively beam transmission NO 2 The signal measured after the gas cell and the vacuum gas cell, a is I 1 And pair of IThe ratio of the numbers is that when the concentration of the measured gas increases, the incident light is absorbed more, the optical signal decreases, I 1 increasing/I, increasing a with it; otherwise, the concentration of the detected gas is reduced, the absorption of the incident light is smaller, I is increased, I 1 decreasing/I, a decreases accordingly. It can be seen that a varies monotonically with the measured gas concentration. Through experimental test, the target NO is found 2 There is a linear relationship between the concentration of the gas and a, with a proportionality coefficient k. Using a scaling method, the relationship between them and the k value can be obtained. By using the relation and the k value, NO can be realized 2 Is a quantitative distribution probe of (2). In actual measurement, even if the exact same optical setup is used, the detectors of the two sub-beam cameras may have slightly different pixel response non-uniformities, which may be necessary to make a flat field correction in order to reduce the error, which may be achieved by subtracting a background value, selecting NO 2 Shooting and imaging the clean sky background near the discharge point, wherein the signal values obtained by the two sub-optical path camera modules are I respectively 1ref And I ref Likewise take I 1ref And I ref As a background value, the influence of the unevenness can be effectively reduced.
The image obtained by correcting the measuring light path can be used for correcting and eliminating the interference influence of smoke dust and water vapor. NO in the band of the light beam passing through the filter 2 The absorption of smoke and water vapor is relatively unchanged relative to the wave band of the measuring light path, so that the light beam absorption information measured by the light path can be used for deducting NO from the smoke and water vapor 2 Influence of imaging measurements.
The positioning detection light path can pass through the formed image and combine the measurement light path to quantitatively test the result to position NO 2 And carrying out local amplified focus detection according to the azimuth. Specifically, according to the obtained color image information, the NO measured by combining the measuring light path 2 Emission distribution, adjusting focal length and direction of front zoom lens, and amplifying NO 2 An exhaust region, thereby achieving NO of interest 2 The discharge or leak point is emphasized for observation purposes.
Claims (9)
1. NO (NO) 2 An imaging detector light path system is characterized in that,
the imaging detector system comprises:
main light path: a solar scattered light incident light path (A);
two branch light paths: a positioning correction light path (B) and a measuring light path (C);
four sub-optical paths: a positioning detection light path (D), a correction measurement light path (E), a first sub-measurement light path (F) and a second sub-measurement light path (G);
the solar scattered light incident main light path (A) is a telescopic, collimating and beam splitting light path, and a telescopic collimating lens group (1), an emergent diaphragm (2) and a first beam splitting lens (3) are sequentially arranged on the light path;
the positioning correction light path (B) is provided with a second beam splitting mirror (4);
the measuring light path (C) is provided with a first optical filter (5) and a third beam splitter (6);
the positioning detection light path (D) is provided with a first camera (7);
the correction measuring light path (E) is provided with a second optical filter (8), a third gas pool unit (9) and a second camera (10);
the first sub-measuring light path (F) is provided with a first gas pool unit (11) and a third camera (12);
the second sub-measuring light path (G) is provided with a second gas pool unit (13) and a fourth camera (14);
the solar scattered light in the target area enters the imaging detector system through the telescopic collimating lens group (1), and is collimated and then enters the first beam splitter (3) through the emergent diaphragm (2) to be split into two different light beams: one beam of light enters the positioning correction light path (B), passes through the second beam splitter (4) and is split into two beams again: one beam of light reaches the first camera (7) for imaging, and the other beam of light passes through the second optical filter (8) and the third gas pool unit (9) and then is imaged on the second camera (10); the other beam of light emitted from the first beam splitter (3) enters the measuring light path (C), passes through the first filter (5) and then reaches the third beam splitter (6), and is split into two beams of light again: one beam passes through a first gas cell unit (11) and is imaged on a third camera (12), and the other beam passes through a second gas cell unit (13) and is finally imaged on a fourth camera (14).
2. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the telescopic collimating lens group (1) consists of a plurality of spherical lenses and an aspheric lens, the focal length of the telescopic collimating lens group is adjustable, the aperture of a diaphragm of the emergent diaphragm (2) is adjustable, the first beam splitter (3) is a flat beam splitter, and the beam splitting ratio of the first beam splitter is 50:50.
3. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the second beam splitter (4) is a flat beam splitter, and the beam splitting ratio is 50:50.
4. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the first optical filter (5) is a bandpass optical filter, the center wavelength is 436nm, the half-width is 10nm, the cut-off frequency is 426nm and 446nm, the transmittance in the range of 433-439nm is more than 85%, the third beam splitter (6) is a flat beam splitter, and the beam splitting ratio is 50:50.
5. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the second optical filter (8) is a bandpass optical filter, the center wavelength is 600nm, the half-width is 10nm, the third gas pool unit (9) is a quartz glass pool, the interior is vacuumized, and the second camera (10) is a monochromatic CMOS camera.
6. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the first gas tank unit (11) is a quartz glass tank, and NO is sealed inside the first gas tank unit 2 Gas, and NO 2 The gas concentration is greater than 1X 10 18 molec/cm 2 The third camera (12) is a monochromatic CMOS camera.
7. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the second gas tank unit (13) is a quartz glass tank, the interior of the second gas tank unit is vacuumized, and the fourth camera (14) is a monochromatic CMOS camera.
8. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the first camera (7) is a color CMOS camera.
9. A NO according to claim 1 2 An imaging detector light path system is characterized in that,
the positioning detection light path (D) and the correction measuring light path (E) share a front positioning correction light path (B), the first sub-measuring light path (F) and the second sub-measuring light path (G) share a front measuring light path (C), and the positioning correction light path (B) and the measuring light path (C) share a forefront solar scattered light incident light path (A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310471991.0A CN116465830A (en) | 2023-04-27 | 2023-04-27 | NO (NO) 2 Imaging detector light path system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310471991.0A CN116465830A (en) | 2023-04-27 | 2023-04-27 | NO (NO) 2 Imaging detector light path system |
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| CN116465830A true CN116465830A (en) | 2023-07-21 |
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| CN202310471991.0A Pending CN116465830A (en) | 2023-04-27 | 2023-04-27 | NO (NO) 2 Imaging detector light path system |
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