CN103471994A - Detection device for gas multi-reflect pool with single fiber transmission function - Google Patents
Detection device for gas multi-reflect pool with single fiber transmission function Download PDFInfo
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- CN103471994A CN103471994A CN2013104092582A CN201310409258A CN103471994A CN 103471994 A CN103471994 A CN 103471994A CN 2013104092582 A CN2013104092582 A CN 2013104092582A CN 201310409258 A CN201310409258 A CN 201310409258A CN 103471994 A CN103471994 A CN 103471994A
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Abstract
The invention provides a detection device for a gas multi-reflect pool with a single fiber transmission function. The detection device comprises a laser device, a detector, a circulator and the gas multi-reflect pool, wherein the gas multi-reflect pool comprises a polarizing film and two collimators; the laser device and the detector are connected with a transmission optical fiber and a light path of the polarizing film through the circulator; tuning laser light with a specific wavelength, output by the laser device, is input into the polarizing film through the circulator; light rays output by the polarizing film are injected into the gas multi-reflect pool through the first collimator, are reflected for multiple times in the pool and are absorbed by sample gas; the output light rays of the gas multi-reflect pool are injected into the second collimator and are output to the polarizing film through the second collimator; the light rays from the polarizing film are output to the detector through the circulator; the detector is used for converting a light signal carrying gas absorption information into an electric signal and outputting the electric signal. The detection device has the advantages and positive effects that the problem of interference of incident and emergent rays with the same wavelength transmitted by the same optical fiber is solved and the light signal can be transmitted and received by one optical fiber.
Description
Technical field
The present invention relates to sniffer, particularly a kind of single fiber transport gas multiple reflecting pool sniffer.
Background technology
Along with developing rapidly of economical activities of mankind and production, in a large amount of consumption energy, also the polluters such as a large amount of industrial gaseous wastees, vehicle exhaust and soot dust granule are entered to atmosphere, cause the pollution of atmosphere.Prevent and remedy pollution, at first will understand pollution, where correctly understand pollutant sources in, what composition is, amount has how many, and impact has much, how dark harm have, and only has everything is made carefully, conscientiously, after extensive investigations research, just can make way and the measure of control.Therefore, use the gas multiple reflecting pool to monitor in real time ambient atmosphere, can understand and grasp the dynamic of constituent of atomsphere, the effect of playing monitoring and preventing and remedying pollution, significant to the protection of atmospheric environment.
The gas multiple reflecting pool to trace gas concentration testing process is: gas to be measured is passed into to the gas multiple reflecting pool.The tuning laser that laser instrument is exported certain specific wavelength incides the gas multiple reflecting pool after collimating device collimation, in pond through Multi reflection and after the absorption of sample gas, output light is detected device and receives, the light signal that detector will carry gas absorption information is converted to electric signal, and the input computing machine carries out subsequent treatment and analysis.
The gas multiple reflecting pool is the important step that gas detects, limitation due to self-technique, it is the interference problem of the incident of same Optical Fiber Transmission Same Wavelength and emergent ray, traditional gas multiple reflecting pool need to be by an Optical Fiber Transmission incident light, the electric signal of plain conductor transmission detector conversion, and can't realize that an optical fiber completes emission and the reception work of light signal.
Summary of the invention
Purpose of the present invention is exactly the above-mentioned defect that will overcome prior art, provides a kind of and can complete the single fiber transport gas multiple reflecting pool sniffer of emission and the reception of light signal by an optical fiber.
For achieving the above object, single fiber transport gas multiple reflecting pool sniffer provided by the invention, comprise laser instrument, detector and gas multiple reflecting pool, described gas multiple reflecting pool comprises the pond body, be provided with incident mirror and catoptron in the body of pond, also comprise circulator, described gas multiple reflecting pool also comprises polaroid and 2 collimating apparatuss, the incident mirror is provided with into perforation and perforation hole, described laser instrument is connected with the polaroid light path with Transmission Fibers through circulator with detector, first collimator is arranged in the output light path of polaroid, the second collimating apparatus is arranged in the input light path of polaroid, laser instrument is exported the tuning laser of certain specific wavelength through circulator input polarization sheet, the light of polaroid output is injected described gas multiple reflecting pool through first collimator by entering perforation, in pond through Multi reflection and after the absorption of sample gas, the output light of described gas multiple reflecting pool is injected the second collimating apparatus by perforation hole, export light to polaroid through described the second collimating apparatus, the light that polaroid is passed back exports detector to through circulator, the light signal that detector will carry gas absorption information is converted to electric signal output.
Single fiber transport gas multiple reflecting pool sniffer of the present invention, wherein said gas multiple reflecting pool is the Herriott pond, and place on incident mirror and mirror surface opposite, and two spherical mirrors different by radius-of-curvature form.
Single fiber transport gas multiple reflecting pool sniffer of the present invention, wherein said detector be connected with computing machine and by output electric signal transmission to computing machine.
Advantage and the good effect of single fiber transport gas multiple reflecting pool sniffer of the present invention are: owing to adopting circulator, polaroid and 2 collimating apparatuss to carry out the improvement of gas multiple reflecting pool, solve the interference problem of the incident of same Optical Fiber Transmission Same Wavelength and emergent ray, realized being completed by an optical fiber emission and the reception work of light signal.
Below in conjunction with embodiment, with reference to accompanying drawing, be elaborated.
The accompanying drawing explanation
Fig. 1 is the structural representation of single fiber transport gas multiple reflecting pool sniffer of the present invention.
Embodiment
Describe the embodiment of single fiber transport gas multiple reflecting pool sniffer of the present invention in detail below in conjunction with accompanying drawing.
Selection absorption approach according to gas molecule, gas molecule can only absorb the photon of difference of energy that those energy just in time equal its certain two energy level, and the gas of different molecular structures can absorb because of the different energy levels that its different structure determine the photon of different frequency.The gas molecule configurations, the absorption spectrum of gas with various is also different because of molecular structure, and the absorbing state that therefore detects certain special wavelength light can be carried out the qualitative and quantitative analysis of gas.
According to Beer-Lambert law: the monochromatic light that wavelength is λ through the long gas multiple reflecting pool for L after:
I
(1)=I
(0)exp[-α(λ)LC]
Wherein, I (0), I (1) are respectively incident and output intensity, and α (λ) is the absorption coefficient of gas to wavelength X light, and C is gas concentration, that is:
Ideally, if oneself knows the absorption coefficient of wavelength X light, by measuring the light intensity after gas absorption, can obtain the concentration C of gaseous sample to be measured.
With reference to Fig. 1, single fiber transport gas multiple reflecting pool sniffer of the present invention comprises laser instrument 11, detector 12, circulator 10 and gas multiple reflecting pool 1.Gas multiple reflecting pool 1 comprises in the body of Ti， pond, pond and is provided with incident mirror 2 and catoptron 3, and incident mirror 2 is provided with into perforation 4 and perforation hole 5.Gas multiple reflecting pool 1 also comprises polaroid 8 and 2 collimating apparatuss 6,7.
The comparatively simple Herriott of the optical system of gas multiple reflecting pool 1 pond, be comprised of two spherical mirrors.The incident mirror 2 that radius-of-curvature is different is placed face-to-face with catoptron 3, forms the Multi reflection chamber.
In the embodiment of single fiber transport gas multiple reflecting pool sniffer of the present invention, detector is connected with computing machine and the electric signal transmission of output to computing machine is carried out to subsequent treatment and analysis.
Single fiber transport gas multiple reflecting pool sniffer of the present invention, solved the interference problem of the incident of same Optical Fiber Transmission Same Wavelength and emergent ray, realizes that an optical fiber completes emission and the reception work of light signal.
Embodiment recited above is described the preferred embodiment of the present invention, not the spirit and scope of the present invention is limited.Under the prerequisite that does not break away from design concept of the present invention; various modification and improvement that this area ordinary person makes technical scheme of the present invention; all should drop into protection scope of the present invention, the technology contents that the present invention asks for protection, all be documented in claims.
Claims (3)
1. a multi-dimension laser auto-alignment gas multiple reflecting pool sniffer, comprise laser instrument (11), detector (12) and gas multiple reflecting pool (1), described gas multiple reflecting pool (1) comprises the pond body, be provided with incident mirror (2) and catoptron (3) in the body of described pond, it is characterized in that: described gas multiple reflecting pool (1) also comprises built-in multidimensional adjusting bracket (8) and 2 collimating apparatuss (6, 7), described multidimensional adjusting bracket (8) is positioned at the outside of described incident mirror (2), 2 described collimating apparatuss (6, 7) be arranged on respectively on described multidimensional adjusting bracket (8), first collimator (6) is arranged in the output light path of described gas multiple reflecting pool (1), the second collimating apparatus (7) is arranged in the input light path of described gas multiple reflecting pool (1), described collimating apparatus (6, 7) relevant to the position of incident mirror (2) in the upper hard-wired position of multidimensional adjusting bracket (8), by following formula, determined:
cosθ=1-(d/2f)，
In formula, x
nfor collimating apparatus is entering the distance of perforation place apart from incident mirror (2) center, x
0for entering the distance at perforation centre distance incident mirror 2 centers, the distance between mirrors that d is incident mirror (2) and catoptron (3), the radius-of-curvature that f is incident mirror (2) and catoptron (3), x
0' be space light incident slope, the reflection angle that θ is space light, n is order of reflection; While determining the second collimating apparatus (7) position, in above formula, n is 1; While determining first collimator (6) position, in above formula, n is order of reflection;
Described incident mirror (2) is provided with into perforation (5) and perforation hole (4), and described laser instrument (11) is connected with described the second collimating apparatus (7) light path through Transmission Fibers, and described detector (12) is connected with described first collimator (6) light path through Transmission Fibers; The tuning laser of described laser instrument (11) output specific wavelength is entered perforation (5) and is injected described gas multiple reflecting pool (1) by described through described the second collimating apparatus (7), in pond through Multi reflection and after the absorption of sample gas, the output light of described gas multiple reflecting pool (1) is injected described first collimator (6) by described perforation hole (4), the light that described first collimator (6) is passed back exports described detector (12) to, and the light signal that described detector (12) will carry gas absorption information is converted to electric signal output.
2. multi-dimension laser auto-alignment gas multiple reflecting pool sniffer according to claim 1, it is characterized in that: wherein said gas multiple reflecting pool (1) is the Herriott pond, described incident mirror (2) is placed face-to-face with described catoptron (3), and two spherical mirrors identical by radius-of-curvature form.
3. multi-dimension laser auto-alignment gas multiple reflecting pool sniffer according to claim 1 and 2 is characterized in that: wherein said detector (12) be connected with computing machine and by the electric signal transmission of output to described computing machine.
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| CN2013104092582A CN103471994A (en) | 2013-09-09 | 2013-09-09 | Detection device for gas multi-reflect pool with single fiber transmission function |
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| CN2013104092582A CN103471994A (en) | 2013-09-09 | 2013-09-09 | Detection device for gas multi-reflect pool with single fiber transmission function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502278A (en) * | 2014-12-11 | 2015-04-08 | 北京航天易联科技发展有限公司 | Gas chamber of optic fiber gas sensor |
| CN106959271A (en) * | 2016-01-12 | 2017-07-18 | 徐州旭海光电科技有限公司 | Long light path air chamber with stabilization package structure |
| CN108279215A (en) * | 2017-12-26 | 2018-07-13 | 聚光科技(杭州)股份有限公司 | Photo-electric gas-detecting device and its working method |
| CN109115721A (en) * | 2018-09-14 | 2019-01-01 | 国家海洋局第海洋研究所 | There is the gas remote measurement device of self-calibration function based on tunable laser |
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| US6064488A (en) * | 1997-06-06 | 2000-05-16 | Monitor Labs, Inc. | Method and apparatus for in situ gas concentration measurement |
| CN101178153A (en) * | 2007-12-07 | 2008-05-14 | 中国科学技术大学 | Locating method and system for city gas pipeline leakage test |
| CN101545856A (en) * | 2009-04-30 | 2009-09-30 | 山东省科学院激光研究所 | Fibre optic gas detector for fire hazard of coal gab area |
| CN201974374U (en) * | 2011-01-13 | 2011-09-14 | 山西潞安环保能源开发股份有限公司 | Optical fiber gas sensing chamber |
| CN203534951U (en) * | 2013-09-09 | 2014-04-09 | 中国电子科技集团公司第八研究所 | Single optical fiber transmission gas multiple-reflection tank detection device |
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2013
- 2013-09-09 CN CN2013104092582A patent/CN103471994A/en active Pending
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| US6064488A (en) * | 1997-06-06 | 2000-05-16 | Monitor Labs, Inc. | Method and apparatus for in situ gas concentration measurement |
| CN101178153A (en) * | 2007-12-07 | 2008-05-14 | 中国科学技术大学 | Locating method and system for city gas pipeline leakage test |
| CN101545856A (en) * | 2009-04-30 | 2009-09-30 | 山东省科学院激光研究所 | Fibre optic gas detector for fire hazard of coal gab area |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502278A (en) * | 2014-12-11 | 2015-04-08 | 北京航天易联科技发展有限公司 | Gas chamber of optic fiber gas sensor |
| CN106959271A (en) * | 2016-01-12 | 2017-07-18 | 徐州旭海光电科技有限公司 | Long light path air chamber with stabilization package structure |
| CN108279215A (en) * | 2017-12-26 | 2018-07-13 | 聚光科技(杭州)股份有限公司 | Photo-electric gas-detecting device and its working method |
| CN108279215B (en) * | 2017-12-26 | 2023-09-05 | 聚光科技(杭州)股份有限公司 | Photoelectric gas detection device and working method thereof |
| CN109115721A (en) * | 2018-09-14 | 2019-01-01 | 国家海洋局第海洋研究所 | There is the gas remote measurement device of self-calibration function based on tunable laser |
| CN109115721B (en) * | 2018-09-14 | 2024-05-28 | 国家海洋局第一海洋研究所 | Gas telemetry device with self-calibration function based on tunable laser |
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Application publication date: 20131225 |