CN101281124A - Wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system - Google Patents
Wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system Download PDFInfo
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- CN101281124A CN101281124A CNA2008100623473A CN200810062347A CN101281124A CN 101281124 A CN101281124 A CN 101281124A CN A2008100623473 A CNA2008100623473 A CN A2008100623473A CN 200810062347 A CN200810062347 A CN 200810062347A CN 101281124 A CN101281124 A CN 101281124A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000000862 absorption spectrum Methods 0.000 title claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000003071 parasitic effect Effects 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 230000004313 glare Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 21
- 238000000034 method Methods 0.000 description 13
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001658 differential optical absorption spectrophotometry Methods 0.000 description 1
- OMBRFUXPXNIUCZ-UHFFFAOYSA-N dioxidonitrogen(1+) Chemical compound O=[N+]=O OMBRFUXPXNIUCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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- 229910052811 halogen oxide Inorganic materials 0.000 description 1
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Abstract
The invention discloses a broadband cavity enhanced absorption spectrum atmospheric environment photoelectric monitoring system, which mainly comprises a radiation source, a collection shading installment, a broadband enhanced cavity, a filter collection installment and a detector order, which are connected in sequence. The invention uses a high reflection mirror to form the enhanced cavity to extend the optical path, obviously enhances the detection sensitivity, simultaneously, realizes the open online detection in the small spatial scope, and may detects densities of one or a plurality of trace gas components at real-time, removes the mutual disturbing effect of different components at the same time.
Description
Technical field
The present invention relates to a kind of pick-up unit of measuring polluter content in the atmosphere, especially, relate to a kind of in little spatial dimension trace contamination material SO in the continuous detecting atmosphere
2, NO
XWideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system with dirt content.
Background technology
Major pollutants in the atmosphere are SO
2, NO
XAnd dust, traditional atmosphere pollution detection system is an electrochemical method at present.Use the probe and the gas generation chemical reaction of sensor, can measure the composition and the concentration of gas accurately, but the time one is long, because the chemical substance consumption of sensor probe, descending appears in measuring accuracy, and service time is shorter.In addition, a kind of gas needs a kind of sensor, and multiple gases just needs multiple sensors, needs periodic replacement.With high costs, safeguard complicated.
Except electrochemical process, be exactly optical means.At present, the optical means that precision is higher, newer a kind of be long-range difference spectrum DOAS method, this method is judged the concentration of dusty gas by the degree of absorption of dusty gas on the long light path, and precision is higher, when light path surpasses 10 kms, can reach PPT ranks up to a hundred.But light path is oversize, and thousands of easily rice is subject to disturb, and measurement result is the mean value on the light path, the space distribution of energy measurement pollutant not, and limitation is too big.
And, detect at present in the method for trace gas concentration of component in the atmosphere for low concentration trace gas component (nitrogen peroxide for example, nitrous acid, halogen oxide etc.) can't realize continuous detecting, can't realize that the more online point in the little spatial dimension detects with investigation gas pollutant space distribution and discovery source.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system is provided, the present invention can high precision, high spatial resolution detects trace gas component concentrations in the atmosphere.
The objective of the invention is to be achieved through the following technical solutions: a kind of wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system, it mainly by radiation source, converge shade, broadband and strengthen chamber, filtering converging device and detecting device and be linked in sequence and form.
Described radiation source is rearranged with optical axis by white light source and unthreaded hole order; The described shade that converges is made up of convex lens and diaphragm; Described broadband strengthens the chamber to be made up of the two sides high reflective mirror, and the broadband strengthens the chamber can be sealed, and also can open; Described filtering converging device is rearranged with optical axis by filter plate, monochromator and convex lens order; Described detecting device is a spectrometer.
The invention has the beneficial effects as follows, utilize high reflection mirror to constitute and strengthen chamber prolongation light path, when significantly improving detection sensitivity, in little spatial dimension, realize open online detection, and can detect one or more trace gas concentration of component in real time, get rid of simultaneously and interfere with each other influence between different component.
Description of drawings
Fig. 1 is the structure principle chart of wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system of the present invention;
Fig. 2 is a process flow diagram of using the method that the present invention detects;
Among the figure, radiation source 1, converge shade 2, broadband and strengthen chamber 3, filtering converging device 4, detecting device 5.
Embodiment
The principle that the present invention is based on the atmospheric environment photoelectric monitoring system of chamber, broadband enhancement techniques is to adopt the light of a branch of specific band, by detecting the space, and in detecting the F-P chamber of forming by the two sides high reflection mirror at the two ends, space, form vibration back and forth, significantly prolong effective light path, thereby effectively reduce detected gas concentration of component lower limit, and form effective detection signal.The trace gas concentration of component is calculated by fitting technique in one or more atmosphere, has overcome the interference between different component.This system comprises a light source that forms specific wavelength light, is used to guide this light by detecting the space and forming the optical system of vibration back and forth and be used to receive detector this light and that produce signal.Described signal indication be the absorptivity of the light of specific band, and specific wave band is applied to trace gas component in one or more specific atmosphere.By this technology that specific band light is vibrated back and forth, be called for short chamber, broadband enhancement techniques, when the trace gas component is present in the detection space, specific band light is absorbed repeatedly, promptly be equivalent to the faint absorption signal quilt repeatedly back and forth afterwards amplification of single, thereby realized the purpose of the high sensitivity atmospheric trace gas detection in little spatial dimension by detecting the space.
As shown in Figure 1, wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system of the present invention mainly by radiation source 1, converge shade 2, broadband and strengthen chamber 3, filtering converging device 4 and detecting device 5 and form.Wherein, radiation source 1 with converge shade 2 and link to each other; Converging shade 2 links to each other with enhancing chamber 3, broadband; Filtering converging device 4 strengthens chamber 3 with the broadband and links to each other; Detecting device 5 links to each other with filtering converging device 4.All devices are encapsulated in the shell of a sealing.
Give off a branch of divergent rays from radiation source 1; Converge and keep off except that the part parasitic light through converging shade 2; Enter the broadband and strengthen chamber 3, light is concussion repeatedly in the broadband strengthens chamber 3, from other end outgoing; Light enters filtering converging device 4, and filtering does not strengthen the wave band of absorption, removes veiling glare through monochromator, converges to a bit by convex lens; Arrive detecting device 5, device 5 is analyzed calibrating after testing, draws pollutant concentration.
Fig. 2 has represented that utilization the present invention detects the method for trace gas in the atmosphere, in conjunction with the analytical instrument of Fig. 1, and, can detect the concentration of some trace gas in the atmospheric environment by changing different testing locations, describe the space distribution situation of polluter, and analyze the possible place of polluting the source.
The selected space of detecting of step 21 needs consider wind direction, the precipitation influence that detection brings to system, and daylight causes the increase of system's parasitic light, these all can influence the testing result of system.
Interpretation of result that step 25 measures arrangement forms report, submits corresponding department to, for the relevant decision-making of government provides data to support.
Claims (6)
1, a kind of wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system is characterized in that, it comprises:
One radiation source.
One converges shade, links to each other with radiation source, converges the light that radiation source sends, and blocks parasitic light.
One broadband strengthens the chamber, and converges shade and links to each other, and light enters from a side, in cavity internal reflection, absorption and enhancing, penetrates from opposite side.
One filtering converging device strengthens the chamber with the broadband and links to each other, and the light of the irrelevant wave band of filtering is removed veiling glare, and the light that will pass through converges to a bit; With
One detecting device links to each other with the filtering converging device, receives the light that converges, and analyzes and draws the component that is absorbed gas.
2, wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system according to claim 1 is characterized in that, described radiation source is rearranged with optical axis by white light source and unthreaded hole order.
3, wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system according to claim 1 is characterized in that, the described shade that converges is made up of convex lens and diaphragm.
4, wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system according to claim 1 is characterized in that, described broadband strengthens the chamber to be made up of the two sides high reflective mirror, and the broadband strengthens the chamber can be sealed, and also can open.
5, wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system according to claim 1 is characterized in that, described filtering converging device is rearranged with optical axis by filter plate, monochromator and convex lens order.
6, wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system according to claim 1 is characterized in that, described detecting device is a spectrometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100623473A CN101281124B (en) | 2008-05-19 | 2008-05-19 | Wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system |
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| CN2008100623473A CN101281124B (en) | 2008-05-19 | 2008-05-19 | Wideband cavity reinforced absorption spectrum atmospheric environment photoelectric monitoring system |
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| CN101281124A true CN101281124A (en) | 2008-10-08 |
| CN101281124B CN101281124B (en) | 2010-08-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237129A (en) * | 2014-10-08 | 2014-12-24 | 上海理工大学 | Sealing adjusting mirror bracket for cavity enhanced spectrum instrument |
| CN104596955A (en) * | 2014-12-11 | 2015-05-06 | 中国科学院合肥物质科学研究院 | Cavity enhanced absorption spectrum device and method for simultaneous measurement of trace gas concentration and aerosol extinction |
| CN106198471A (en) * | 2016-05-06 | 2016-12-07 | 黄辉 | A biochemical fluorescence analyzer based on a light-guiding capillary and its detection method |
| CN108593597A (en) * | 2018-01-26 | 2018-09-28 | 西安捷亿达能源科技有限公司 | Natural gas leaking early warning monitoring device and method based on optical fiber FP lumen type probe |
| CN110596026A (en) * | 2019-10-12 | 2019-12-20 | 中国科学院合肥物质科学研究院 | Broadband Cavity Enhancer |
-
2008
- 2008-05-19 CN CN2008100623473A patent/CN101281124B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237129A (en) * | 2014-10-08 | 2014-12-24 | 上海理工大学 | Sealing adjusting mirror bracket for cavity enhanced spectrum instrument |
| CN104596955A (en) * | 2014-12-11 | 2015-05-06 | 中国科学院合肥物质科学研究院 | Cavity enhanced absorption spectrum device and method for simultaneous measurement of trace gas concentration and aerosol extinction |
| CN106198471A (en) * | 2016-05-06 | 2016-12-07 | 黄辉 | A biochemical fluorescence analyzer based on a light-guiding capillary and its detection method |
| CN106198471B (en) * | 2016-05-06 | 2019-04-09 | 黄辉 | A light-guiding capillary-based biochemical fluorescence analyzer and its detection method |
| CN108593597A (en) * | 2018-01-26 | 2018-09-28 | 西安捷亿达能源科技有限公司 | Natural gas leaking early warning monitoring device and method based on optical fiber FP lumen type probe |
| CN110596026A (en) * | 2019-10-12 | 2019-12-20 | 中国科学院合肥物质科学研究院 | Broadband Cavity Enhancer |
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| Publication number | Publication date |
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| CN101281124B (en) | 2010-08-11 |
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