CN105651710A - Optical remote sensing method for acquiring absolute light intensity of aerosol - Google Patents
Optical remote sensing method for acquiring absolute light intensity of aerosol Download PDFInfo
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- CN105651710A CN105651710A CN201511010696.7A CN201511010696A CN105651710A CN 105651710 A CN105651710 A CN 105651710A CN 201511010696 A CN201511010696 A CN 201511010696A CN 105651710 A CN105651710 A CN 105651710A
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Abstract
The invention discloses an optical remote sensing method for acquiring absolute light intensity of aerosol. According to the invention, an optical remote sensing system composed of at least a light source, optical fiber, a CCD detector, a spectrograph, a telescope, optical corner reflectors, a pan-tilt, a controller and a computer is involved. The telescope is connected to the spectrograph through optical fiber. The spectrograph is connected to the CCD detector, which is connected to the controller. Two optical corner reflectors are arranged. The telescope is installed on the pan-tilt. The controller is connected to the detector, the pan-tilt and the computer, and sets measuring time to drive the telescope to rotate. Through different light paths formed by the light source and the two optical corner reflectors, light intensity of different light distances is measured. The controller is connected to the computer and transmits a measuring result into the computer so as to calculate absolute light intensity of aerosol. Selection of light distances is set according to detection limit in measurement of atmospheric pollution gas types and aerosol extinction coefficients. The invention provides technical support for treating national haze weather, reducing aerosol pollution and researching atmospheric gas phase/particle heterogeneous reaction.
Description
Technical field
The present invention relates to a kind of optical remote sensing method obtaining the absolute light intensity of aerosol, belong to Atmospheric Chemistry technical field.
Background technology
Aerosol is disperseed by solid or liquid fine particle and is suspended in the colloidal dispersion system formed in gas medium, and also known as gas diffuser system, its dispersion phase is solid or liquid fine particle, and it is sized to 0.001��100 micron, and disperse medium is gas. It aerial cloud, mist, dust, boiler in industrial and transport service and the cigarette that in various electromotor, unburnt fuel is formed, the solid dust formed when mining, stone pit mill material and grain processing, artificial shelter smoke screen and toxic smoke etc. are all aerocolloidal instantiations. Haze is that a large amount of imperceptible dry grits etc. swim aloft equably, makes the horizontal visibility general research of chaotic phenomenon of the air less than 10 kilometers, and dry grit here refers to Dry aerosol particle. Generally, when visibility is likely to the impact (impact of haze) of existing Dry aerosol when 1-10 kilometer, it is also possible to have the contribution (i.e. the contribution of mist) of water droplet, and be not easily distinguishable, so thus referred to as " mist-haze " phenomenon. Owing to there is no the particulate nuclei of condensation (or ice-nucleus) as cloud and mist in actual air, it is impossible to form mist, so mist is all relevant with particulate with the behind of haze.
Difference absorption spectrum method (differentialopticalabsorptionspectroscopy, DOAS) proposed by the Platt of Heidelberg University Environment physics Institute of Germany the earliest, be specifically designed to the monitoring of the harmful gas in city, underpass, industry mining area. Its ultimate principle is to be characterized as basis with tested gas at the difference absorption spectrum of Uv and visible light wave band, is carried out the concentration of inverting gas by difference absorption spectrum intensity. Actively DOAS aspect, a company of Sweden successfully upgraded in 1986 and establishes DOAS technology the analysis for Hg, and Thermo Electron Corp. of the U.S. also devises the DOAS system of oneself.Nineteen ninety, the talent such as Axelson has used Cassegrain structure, and receiving and transmitting unit is arranged on same telescopic system, and this system is used so far. 2005, the layer scanning technology of DOAS was actually applied and obtains good result, and it can obtain the CONCENTRATION DISTRIBUTION of the two dimension of trace gas or three-dimensional, monitored highly beneficial to the three dimensions of gas. Passive DOAS aspect, has progressively achieved and has observed aerial detection then the development to spaceborne remote measurement from ground. Wherein, spaceborne remote measurement as platform, observes some pollutant or the atmospheric trace gas distribution situation in the whole world mainly by satellite from the atmosphere external world. Calendar year 2001, the scientist of Sweden takes the lead in developing mini-DOAS equipment, and the character of its portability and ease of Use makes this technology be applied to rapidly in dusty gas monitoring, the place that the discharge of pollutant sources such as this technology is applied to power plant now, paper mill are concentrated.
But along with air combined pollution is on the rise, causing oxidizing capacity to strengthen, gas is being accelerated to the conversion of particulate matter, want to realize to air combined pollution gas and aerosol in real time, obtain online, it is necessary to be a kind of on a large scale to its new method monitored simultaneously.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of optical remote sensing method obtaining the absolute light intensity of aerosol.
For reaching above-mentioned purpose, the technology used in the present invention means are: a kind of optical remote sensing method obtaining the absolute light intensity of aerosol, at least include light source, optical fiber, ccd detector, spectrogrph, telescope, corner reflector, The Cloud Terrace, controller, and the optical remote sensing system of computer composition, telescope connects spectrogrph by optical fiber, spectrogrph connects ccd detector, ccd detector connects controller, wherein corner reflector arranges two groups, telescope is arranged on The Cloud Terrace, controller connects detector and The Cloud Terrace, and by the controller setting measurement time, controlling The Cloud Terrace drives telescope to realize rotating, by the different light paths that light source and two groups of corner reflectors are formed, measure the light intensity of different light path, controller connects computer and is sent in computer by measurement result and carries out the absolute light intensity of aerosol calculates, the selection of light path is according to measuring Pollution Gas kind and the requirement setting of Aerosol Extinction detection limit.
Further, described light source is broadband xenon arc lamp light source, and described spectrogrph is wide-band spectrum instrument.
Further, described optical remote sensing system adopts timing rotation scanning, measure interval according to measuring sensitivity and weather conditions synthetic setting, total absorption of the atmosphere pollution to be measured in systematic survey light path coverage, by the extinction coefficient that the algorithm acquisition Pollution Gas optimized and aerosol are total, with the total absorption measured within the scope of light path, it is thus achieved that the mean concentration of monitored area.
Further, the absolute light intensity of described aerosol calculates and refers to: the different light paths formed for light source and two groups of corner reflectors, wherein a road light path is designated as, another road light path is designated as, the light intensity that ccd detector receives is designated as respectivelyWith, then:
In formula,Intensity for light source;WithRepresent the correction coefficient of two-way light path, note respectively, extinction coefficient that air is totalFor:
Determine total correction coefficient by visibility, select under clean weather condition, calibrate in 550nm light strength, obtain, so ensure to measure absolute light intensity, correctly obtain extinction coefficient, obtain pollutant based on differential principle;Aerosol physical characteristic is obtained based on kernel function theory.
The invention has the beneficial effects as follows: based on optical remote sensing technology, build the single light source two light path difference absorbing light remote sensing system being light source with broadband xenon arc lamp, design gathers light path, measures Pollution Gas and aerocolloidal total extinction coefficient, accurate Analysis atmospheric trace gas concentration; By visibility meter, under clean condition, with the light intensity at 550nm place, it is achieved system calibration, parse aerocolloidal accurate extinction coefficient, and obtain aerosol physical characteristic based on kernel function theory. For regulation China haze weather, reduce Aerosol Pollution, and research air gas phase/particulate heterogeneous chemical reaction provides technical support.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further elaborated.
Fig. 1: the structural representation of the present invention.
Detailed description of the invention
A kind of optical remote sensing method obtaining the absolute light intensity of aerosol as shown in Figure 1, at least include light source, optical fiber, ccd detector, spectrogrph, telescope, corner reflector, The Cloud Terrace, controller, and the optical remote sensing system of computer composition, telescope connects spectrogrph by optical fiber, spectrogrph connects ccd detector, ccd detector connects controller, wherein corner reflector arranges two groups, telescope is arranged on The Cloud Terrace, controller connects light source and The Cloud Terrace, and by the controller setting measurement time, controlling The Cloud Terrace drives telescope to realize rotating, by the different light paths that light source and two groups of corner reflectors are formed, measure the light intensity of different light path, controller connects computer and is sent in computer by measurement result and carries out the absolute light intensity of aerosol calculates, the selection of light path is according to measuring Pollution Gas kind and the requirement setting of Aerosol Extinction detection limit.
Described light source is broadband xenon arc lamp light source, and described spectrogrph is wide-band spectrum instrument.
Described optical remote sensing system adopts timing rotation scanning, measure interval according to measuring sensitivity and weather conditions synthetic setting, total absorption of the atmosphere pollution to be measured in systematic survey light path coverage, by the extinction coefficient that the algorithm acquisition Pollution Gas optimized and aerosol are total, with the total absorption measured within the scope of light path, it is thus achieved that the mean concentration of monitored area.
The absolute light intensity of described aerosol calculates and refers to: the different light paths formed for light source and two groups of corner reflectors, wherein a road light path is designated as, another road light path is designated as, the light intensity that ccd detector receives is designated as respectivelyWith, then:
In formula,Intensity for light source;WithRepresent the correction coefficient of two-way light path, note respectively, extinction coefficient that air is totalFor:
Determine total correction coefficient by visibility, select under clean weather condition, calibrate in 550nm light strength, obtain, so ensure to measure aerocolloidal absolute light intensity, correctly obtain Aerosol Extinction, obtain pollutant based on differential principle; Aerosol physical characteristic is obtained based on kernel function theory.
The present invention is based on optical remote sensing technology, build the single light source two light path difference absorbing light remote sensing system being light source with broadband xenon arc lamp, design gathers light path, measures Pollution Gas and aerocolloidal total extinction coefficient, accurate Analysis atmospheric trace gas concentration; By visibility meter, under clean condition, with the light intensity at 550nm place, it is achieved system calibration, parse aerocolloidal accurate extinction coefficient, and obtain aerosol physical characteristic based on kernel function theory.For regulation China haze weather, reduce Aerosol Pollution, and research air gas phase/particulate heterogeneous chemical reaction provides technical support.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention. It should be pointed out that, for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (4)
1. the optical remote sensing method obtaining the absolute light intensity of aerosol, at least include light source, optical fiber, ccd detector, spectrogrph, telescope, corner reflector, The Cloud Terrace, controller, and the optical remote sensing system of computer composition, telescope connects spectrogrph by optical fiber, spectrogrph connects ccd detector, ccd detector connects controller, wherein corner reflector arranges two groups, telescope is arranged on The Cloud Terrace, controller connects detector, The Cloud Terrace and computer, and by the controller setting measurement time, controlling The Cloud Terrace drives telescope to realize rotating, by the different light paths that light source and two groups of corner reflectors are formed, measure the light intensity of different light path, controller connects computer and is sent in computer by measurement result and carries out the absolute light intensity of aerosol calculates, the selection of light path is according to measuring Pollution Gas kind and the requirement setting of Aerosol Extinction detection limit.
2. the optical remote sensing method of the absolute light intensity of acquisition aerosol according to claim 1, it is characterised in that: described light source is broadband xenon arc lamp light source, and described spectrogrph is wide-band spectrum instrument.
3. the optical remote sensing method of the absolute light intensity of acquisition aerosol according to claim 1, it is characterized in that: described optical remote sensing system adopts timing rotation scanning, measure interval according to measuring sensitivity and weather conditions synthetic setting, total absorption of the atmosphere pollution to be measured in systematic survey light path coverage, by the extinction coefficient that the algorithm acquisition Pollution Gas optimized and aerosol are total, with the total absorption measured within the scope of light path, it is thus achieved that the mean concentration of monitored area.
4. the optical remote sensing method of the absolute light intensity of acquisition aerosol according to claim 3, it is characterised in that: the absolute light intensity of described aerosol calculates and refers to: the different light paths formed for light source and two groups of corner reflectors, wherein a road light path is designated as, another road light path is designated as, the light intensity that ccd detector receives is designated as respectivelyWith, then:
In formula,Intensity for light source;WithRepresent the correction coefficient of two-way light path respectively,
Note, extinction coefficient that air is totalFor:
Determine total correction coefficient by visibility, select under clean weather condition, calibrate in 550nm light strength,
Arrive, so ensure to measure aerocolloidal absolute light intensity, correctly obtain Aerosol Extinction, obtain pollutant based on differential principle; Aerosol physical characteristic is obtained based on kernel function theory.
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Cited By (4)
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| CN109211879A (en) * | 2018-08-31 | 2019-01-15 | 王寅 | A kind of gas remote measurement device and method |
| CN110687547A (en) * | 2019-09-27 | 2020-01-14 | 北京航天环境工程有限公司 | Toxic and harmful gas environment risk early warning and monitoring method based on remote sensing radar |
| CN113970523A (en) * | 2021-09-17 | 2022-01-25 | 安徽中科华仪科技有限公司 | Shore-based full-laser ship tail gas remote sensing detection method |
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| CN109211879A (en) * | 2018-08-31 | 2019-01-15 | 王寅 | A kind of gas remote measurement device and method |
| CN110687547A (en) * | 2019-09-27 | 2020-01-14 | 北京航天环境工程有限公司 | Toxic and harmful gas environment risk early warning and monitoring method based on remote sensing radar |
| CN113970523A (en) * | 2021-09-17 | 2022-01-25 | 安徽中科华仪科技有限公司 | Shore-based full-laser ship tail gas remote sensing detection method |
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Application publication date: 20160608 |