CN112461777A - Optical active imaging type differential absorption spectrum monitor for polluted gas - Google Patents
Optical active imaging type differential absorption spectrum monitor for polluted gas Download PDFInfo
- Publication number
- CN112461777A CN112461777A CN202011365454.0A CN202011365454A CN112461777A CN 112461777 A CN112461777 A CN 112461777A CN 202011365454 A CN202011365454 A CN 202011365454A CN 112461777 A CN112461777 A CN 112461777A
- Authority
- CN
- China
- Prior art keywords
- imaging
- light
- beams
- ultraviolet light
- ultraviolet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 84
- 238000000862 absorption spectrum Methods 0.000 title claims abstract description 11
- 230000003287 optical effect Effects 0.000 title claims abstract description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000012795 verification Methods 0.000 claims description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 10
- 239000007789 gas Substances 0.000 abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 7
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 abstract description 5
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000005427 atmospheric aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
Abstract
The invention provides a polluted gas optical active imaging type differential absorption spectrum monitor, which comprises: the ultraviolet light source part is used for emitting two beams of ultraviolet light with different wavelengths to target atmosphere; the collimating component is used for converting the two emitted ultraviolet lights into quasi-parallel lights and then emitting the quasi-parallel lights into target atmosphere; the imaging system is used as a detection surface and comprises an imaging lens and an imaging camera with an imaging chip, wherein the scattered light beams are subjected to photosensitive imaging on the detection surface to form a line shape, the imaging lens is used for receiving scattered light, and side scattering atmospheric echo signals in a field range are subjected to photosensitive imaging on the imaging chip to obtain light column images distributed along with the height; and the imaging spectrometer is used for inverting the concentration profile of the atmospheric pollution molecules by extracting the information of the imaging light beams with different wavelengths. The invention is suitable for the requirement of fast tracing in the field of three-dimensional monitoring of ozone, sulfur dioxide and nitrogen dioxide, and is suitable for large-scale application.
Description
Technical Field
The invention relates to the technical field of atmospheric pollution monitoring, in particular to an optical active imaging type differential absorption spectrum monitor for polluted gas.
Background
With the rapid development of economy and industry, the ecological system meets more and more environmental pollution problems. Especially in urban economic development and population concentration, the atmospheric environment field faces many complicated pollution problems. The important measurement and detection research problems are the source tracing monitoring and the space distribution characteristic monitoring of the ozone. Lidar is becoming more and more widely used in the detection of atmospheric pollution molecules. However, the current ozone differential absorption laser system is very expensive, and the complex operation cost is very high.
Disclosure of Invention
The present invention aims to provide an optical active imaging type differential absorption spectrum monitor for a polluted gas, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
an optically active imaging differential absorption spectroscopy monitor for a contaminated gas, comprising:
the ultraviolet light source part is used for emitting two beams of ultraviolet light with different wavelengths to target atmosphere;
the collimating component is used for converting the two emitted ultraviolet lights into quasi-parallel lights and then emitting the quasi-parallel lights into target atmosphere;
the two beams of ultraviolet light emitted into the target atmosphere are absorbed by ozone molecules and subjected to atmospheric scattering to generate scattered light beams;
the imaging system is used as a detection surface and comprises an imaging lens and an imaging camera with an imaging chip, wherein the scattered light beams are subjected to photosensitive imaging on the detection surface to form a line shape, the imaging lens is used for receiving scattered light, and side scattering atmospheric echo signals in a field range are subjected to photosensitive imaging on the imaging chip to obtain light column images distributed along with the height; and
and the imaging spectrometer is used for inverting the concentration profile of the atmospheric pollution molecules by extracting the information of the imaging light beams with different wavelengths.
Preferably, the imaging lens adopts an imaging spectrometer behind the lens, the ultraviolet light beams with different wavelengths are imaged at different positions on the imaging chip, and the imaging spectrometer inverts the concentration profile of the atmospheric pollution molecules by extracting information of the imaging light beams with different wavelengths.
Preferably, the collimating component includes a collimating mirror and a collimator, and the two emitted ultraviolet lights are converted into light beams by the collimating mirror, and then converted into quasi-parallel light by the collimator and emitted into the atmosphere.
Preferably, the imaging system further comprises a filter and a polarizer, the imaging lens is provided with a diaphragm, the filter is based on an optical filter, the polarizer is based on a slit diaphragm, the imaging camera is based on a CCD imaging camera, and the imaging chip is based on a CCD imaging chip.
Preferably, the system further comprises an acquisition and timing control system for controlling the ultraviolet light source part, the imaging system and the imaging spectrometer.
Preferably, the ultraviolet-light-emitting diode calibration device further comprises a calibration light source part, wherein the calibration light source part is used for generating calibration light, the calibration light is used for each beam of ultraviolet light for zero calibration and algorithm verification, and the calibration light source part and the ultraviolet light source part both adopt deep ultraviolet light-emitting diodes.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to an optical active imaging type differential absorption spectrum monitor for polluted gas, which can realize non-blind area profile measurement in a space of 500m by emitting multi-wavelength continuous light beams, imaging different wavelength light beams on different positions on a CCD (charge coupled device) by adopting an imaging spectrometer after passing through a lens, and inverting the concentration profile of atmospheric pollution molecules by extracting the information of the imaging light beams with different wavelengths. The invention has the advantages of low cost, simple structure, convenient debugging and the like. The method is suitable for the requirements of rapid source tracing in the field of three-dimensional monitoring of ozone, sulfur dioxide and nitrogen dioxide, and is also suitable for large-scale application.
Drawings
FIG. 1 is a schematic overall schematic structural view of the present invention;
FIG. 2 is a schematic view of the imaging geometry of the imaging light pillar of the present invention.
In the figure: 1 ultraviolet light source part, 2 calibration light source part, 3 imaging system and 4 collimation part.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1 to 2, the present invention provides a technical solution:
the invention discloses an optical active imaging type differential absorption spectrum monitor for polluted gas, which emits multi-wavelength continuous light beams, adopts an imaging spectrometer after passing through a lens, images different wavelength light beams at different positions on a CCD (charge coupled device), and inverts the concentration profile of atmospheric pollution molecules by extracting the information of the imaging light beams with different wavelengths, so that the non-blind area profile measurement in a space of 500m can be realized. The system has the advantages of low cost, simple structure, convenience in debugging and the like. The method is suitable for the requirements of rapid source tracing in the field of three-dimensional monitoring of ozone, sulfur dioxide and nitrogen dioxide, and is also suitable for large-scale application.
Specifically, taking ozone monitoring as an example:
two beams of ultraviolet light emitted by an ultraviolet light source part and a high-power deep ultraviolet light emitting diode (typical wavelength pairs are 265nm and 295nm) pass through a collimating component 4, which comprises a collimating mirror and a collimator: the collimating lens forms light beams, the light beams are converted into quasi-parallel light through the collimator and emitted to the atmosphere, each beam of ultraviolet light is additionally provided with a calibration light, and a deep ultraviolet light emitting diode is also adopted by the calibration light source part 2 and used for zero calibration, algorithm verification and the like. The two beams of emitted light have certain position difference and angle difference. A deep ultraviolet measurement CCD imaging camera is arranged at a certain distance of the light beams to sense the two light beams. The imaging system 3 is composed of a lens (with a diaphragm), a filter (a filter), a slit diaphragm (a polarizer) and a CCD imaging chip. The laser beam is photosensitive imaged on the detection surface to be linear. The laser beam is absorbed by ozone molecules and subjected to atmospheric scattering, scattered light is received by the imaging lens, atmospheric echo signals are laterally scattered in a field range, and photosensitive imaging is carried out on the CCD imaging chip, so that light column images distributed along with the height can be obtained. Each pixel point is in direct proportion to the scattering coefficient of atmospheric aerosol and molecules in a certain height range and the ozone path absorption attenuation effect, so that the spatial distribution profile of atmospheric ozone in the laser beam space can be obtained through image data according to a certain inversion algorithm. It should be noted that in this embodiment, the calibration light is the calibration light in fig. 1, the lens is also called an imaging lens, i.e., the ultraviolet lens in fig. 1, and the deep ultraviolet measurement CCD imaging camera is the ultraviolet camera in fig. 1.
The invention discloses an optical active imaging type differential absorption spectrum monitor for polluted gas, which emits laser beams covering absorption wavebands (including strong absorption regions and weak absorption regions) of ozone, sulfur dioxide and nitrogen dioxide. The method comprises the steps of adopting 3 pairs of wave band LED light columns of an ozone absorption area, a sulfur dioxide absorption area and a nitrogen dioxide absorption area as emission light sources, adopting a small-angle side imaging mode to receive imaging information of the light columns, extracting a geometric model through established signals to analyze the signals, obtaining distance scattering signals through a calibration mode, and finally obtaining accurate ozone profile distribution information through an inversion model.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An optical active imaging differential absorption spectrum monitor for a polluted gas, comprising:
the ultraviolet light source part is used for emitting two beams of ultraviolet light with different wavelengths to target atmosphere;
the collimating component is used for converting the two emitted ultraviolet lights into quasi-parallel lights and then emitting the quasi-parallel lights into target atmosphere;
the two beams of ultraviolet light emitted into the target atmosphere are absorbed by ozone molecules and subjected to atmospheric scattering to generate scattered light beams;
the imaging system is used as a detection surface and comprises an imaging lens and an imaging camera with an imaging chip, wherein the scattered light beams are subjected to photosensitive imaging on the detection surface to form a line shape, the imaging lens is used for receiving scattered light, and side scattering atmospheric echo signals in a field range are subjected to photosensitive imaging on the imaging chip to obtain light column images distributed along with the height; and
and the imaging spectrometer is used for inverting the concentration profile of the atmospheric pollution molecules by extracting the information of the imaging light beams with different wavelengths.
2. The instrument of claim 1, wherein the imaging lens employs an imaging spectrometer behind the lens, the ultraviolet light beams with different wavelengths are imaged at different positions on the imaging chip, and the imaging spectrometer inverts the concentration profile of atmospheric pollution molecules by extracting information of the imaging light beams with different wavelengths.
3. The differential absorption spectrum monitor as claimed in claim 1, wherein the collimating component comprises a collimator and a collimator, and the two emitted ultraviolet lights pass through the collimator to form a light beam, and then become quasi-parallel lights through the collimator to be emitted into the atmosphere.
4. The instrument according to claim 1, wherein the imaging system further comprises a filter and a polarizer, the imaging lens has a stop, the filter is based on a filter, the polarizer is based on a slit diaphragm, the imaging camera is based on a CCD imaging camera, and the imaging chip is based on a CCD imaging chip.
5. The instrument of claim 1, further comprising a collection and timing control system for controlling the uv source, the imaging system and the imaging spectrometer.
6. The differential absorption spectrum monitor according to any one of claims 1 to 5, further comprising a calibration light source unit for generating calibration light for each ultraviolet light beam for zero calibration and algorithm verification, wherein deep ultraviolet light emitting diodes are used for both the calibration light source unit and the ultraviolet light source unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011365454.0A CN112461777A (en) | 2020-11-28 | 2020-11-28 | Optical active imaging type differential absorption spectrum monitor for polluted gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011365454.0A CN112461777A (en) | 2020-11-28 | 2020-11-28 | Optical active imaging type differential absorption spectrum monitor for polluted gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112461777A true CN112461777A (en) | 2021-03-09 |
Family
ID=74809345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011365454.0A Pending CN112461777A (en) | 2020-11-28 | 2020-11-28 | Optical active imaging type differential absorption spectrum monitor for polluted gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112461777A (en) |
-
2020
- 2020-11-28 CN CN202011365454.0A patent/CN112461777A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11480509B2 (en) | System and method for individual particle sizing using light scattering techniques | |
| US6690472B2 (en) | Pulsed laser linescanner for a backscatter absorption gas imaging system | |
| US7580127B1 (en) | Polarization lidar for the remote detection of aerosol particle shape | |
| CN103616698B (en) | A kind of Fine Particles spatial and temporal distributions Raman Mie scattering lidar measurement mechanism | |
| CN106092997B (en) | Flame detecting device and method based on PLIF technology | |
| CN108132228A (en) | A kind of vehicle exhaust telemetering equipment | |
| CN215833246U (en) | Optical active imaging type differential absorption spectrum monitor for polluted gas | |
| CN105044113B (en) | A kind of sulfur dioxide gas imager | |
| US10663393B2 (en) | Spectrum inspecting apparatus | |
| Burlakov et al. | A differential-absorption lidar for ozone sensing in the upper atmosphere-lower stratosphere | |
| CN112461777A (en) | Optical active imaging type differential absorption spectrum monitor for polluted gas | |
| CN111045216A (en) | Laser emission system with visible light auxiliary light path and light source adjusting method thereof | |
| CN102788763A (en) | Difference absorption spectrum atmospheric monitoring system with laser induced breakdown spectrum serving as light source | |
| RU201025U1 (en) | TWO-CHANNEL LIDAR NEXT IR RANGE | |
| KR20160114445A (en) | Lidar system | |
| CN109425590B (en) | TDLAS alignment system for simultaneously measuring multiple gases | |
| CN113655464B (en) | Method for improving spatial resolution of sham imaging laser radar | |
| KR102323545B1 (en) | Range resolved Three dimensional Atmospheric material distribution measurement system using the light spectrum characteristics exact-inversely reflected at the retroreflector mirror mounted on the mobile system | |
| CN113984601B (en) | Environmental dust monitoring system | |
| RU101836U1 (en) | LIDAR ATMOSPHERIC AIR QUALITY CONTROL SYSTEM | |
| CN111089855B (en) | Differential absorption laser radar NO 2 Space-time distribution day and night automatic detection device | |
| KR100337368B1 (en) | Method For measuring 3 Dimensional Wind Direction/Wind Velocity Using Lidar System having Optical Fiber Receiving Optical Meter | |
| CN215867128U (en) | Samm imaging laser radar with high spatial resolution | |
| CN211877753U (en) | Spectrum system for detecting trace gas concentration | |
| CN112540053A (en) | Open type gas detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |