CN101936885B - Optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system - Google Patents

Optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system Download PDF

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Publication number
CN101936885B
CN101936885B CN201010238277XA CN201010238277A CN101936885B CN 101936885 B CN101936885 B CN 101936885B CN 201010238277X A CN201010238277X A CN 201010238277XA CN 201010238277 A CN201010238277 A CN 201010238277A CN 101936885 B CN101936885 B CN 101936885B
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China
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optical fiber
transmitting
receiving
common port
telescope
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CN201010238277XA
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CN101936885A (en
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魏永杰
陈文亮
徐可欣
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Tianjin Tongyang Science &Technology Development Co., Ltd.
Xianshi Optical Technology Co., Ltd., Tianjin City
Hebei University of Technology
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XIANSHI OPTICAL TECHNOLOGY Co Ltd TIANJIN CITY
TIANJIN TONGYANG SCIENCE &TECHNOLOGY DEVELOPMENT Co Ltd
Hebei University of Technology
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Priority to CN201010238277XA priority Critical patent/CN101936885B/en
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Abstract

The invention provides an optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system, which solves the problems of low spectrum utilization ratio and difficulty in instrument adjustment and optical path centering of the existing typical DOAS system. The measuring system comprises a point light source, a telescope, a spectrograph and an optical fiber bundle with a transceiver integrated structure, wherein, the optical fiber bundle with the transceiver integrated structure is composed of transmitting optical fiber and receiving optical fiber and provided with an optical fiber transceiver common port. The spectrum sent by the point light source is transmitted through the optical fiber transceiver common port from one end of the transmitting optical fiber, aligned through a spherical reflector in the telescope, reflected along the original direction after reaching a pyramid prism, focused through the spherical reflector and then enters the optical fiber transceiver common port, and finally transmitted through the other end of the receiving optical fiber and then led into the spectrograph for spectrum detection. Compared with the typical DOAS system, the measuring system reduces two plane reflectors, avoids a light beam being sheltered by the plane reflector during the transmission process, improves the spectrum utilization ratio and simplifies the instrument adjusting and centering process.

Description

The transmitting-receiving integrated air difference absorption spectrum of optical fiber measuring system
[technical field]:
The present invention relates to the monitoring system of trace gas in a kind of differential optical absorption spectroscopy air quality monitoring system, the especially Measurement of Air.
[background technology]:
The damage by air pollution ecosystem also causes very big harm to health, therefore, at first will monitor various atmosphere pollutions.The monitoring instrument in the many cities of China adopts the point type sampling, can only understand the atmospheric pollution situation and the long-run average in the sampling period of sample space, monitoring point, and the space-time representativeness is relatively poor.Utilize telemetry that difference absorption spectrum learns (DOAS) with its on a large scale, many components detect, the online metering system of continuous real-time is just becoming environmental pollution monitoring ideal tools.Adopt the DOAS technology to monitor several kinds of pollutants simultaneously, can realize complete noncontact online auto monitoring at same spectral absorption wave band; Instrument highly sensitive, monitoring concentration is low; Monitoring range can reach hundreds of rice even thousands of rice, can reflect the average pollution level in a zone, and monitoring result has more representativeness than the single-point monitoring.The DOAS technology is the developing direction of the conventional on-line monitoring technique of current air quality contamination index.
The DOAS system that extensively adopts at present is generally based on the Cassegrain telescope configuration.In this structure; The spectrum that is sent by xenon lamp is collimated into parallel light emergence through catoptron, through the light path of hundreds of rice even thousands of meters, light is converged by receiving end by the prism of corner cube reflection back that is positioned at the other end and to be coupled into optical fiber; Obtain absorption spectrum by the spectrometer detection, as shown in Figure 1.In Fig. 1, be radiated on the spherical reflector 3 after plane mirror 2 reflections that become 45 with optical axis through the continuous spectrum that pointolite (xenon lamp) 1 sends, after spherical reflector 3 reflections, be radiated on the prism of corner cube 4 in a distant place again.The light that prism of corner cube 4 will be radiated at above it converges in the acceptance point position through spherical mirror 3 and plane mirror 5 successively at last after the reflection of former road, send into spectrometer analysis after being received by optical fiber.
This DOAS system based on the Cassegrain telescope configuration because light repeatedly blocks through catoptron, causes the spectrum utilization ratio low, and instrument adjustment and light path centering difficulty.
[summary of the invention]:
It is low to the objective of the invention is to solve existing DOAS system spectrum utilization ratio, and the problem of instrument adjustment and light path centering difficulty, and the transmitting-receiving integrated air difference absorption spectrum of a kind of optical fiber measuring system is provided.
The transmitting-receiving integrated air difference absorption spectrum of optical fiber provided by the invention measuring system; Comprise pointolite, telescope and spectrometer; This system also comprises the transmitting-receiving integrated structured optical fiber bundle with transmitting-receiving optical fiber common port that is made up of launching fiber and reception optical fiber; After the spectrum that described pointolite sends at first is coupled to an end of the intrafascicular launching fiber of transmitting-receiving integrated structured optical fiber, promptly receives and dispatches the optical fiber common port through the other end of launching fiber and penetrate the spherical reflector collimation in telescope; Atmosphere through one section opening; Arrive the prism of corner cube of the telescope light path other end, reflected along former direction then, the reflected light that carries dusty gas information in the atmosphere returns along former direction; Spherical reflector in telescope focus on to get into transmitting-receiving optical fiber common port once more, after after receiving the outgoing of the optical fiber other end lead-in light spectrometer carry out spectral detection.
The intrafascicular transmitting-receiving optical fiber common port of described transmitting-receiving integrated structured optical fiber is positioned on the telescopical optical axis, and the radius of establishing spherical reflector is R, and then receiving and dispatching the optical fiber common port is 1/2R apart from the distance of spherical reflector.
The intrafascicular transmitting-receiving optical fiber common port of transmitting-receiving integrated structured optical fiber can be installed on the three-dimensional mobile platform and can carry out the three-dimensional adjustment.
Advantage of the present invention and good effect: in the transmitting-receiving integrated air difference absorption spectrum measuring system provided by the invention; The integral fibre-optic bundle with public port is adopted in the spectrum transmitting-receiving; Have only a reflecting sphere mirror in the telescope, compare based on the DOAS system of Cassegrain telescope configuration, reduced by two plane mirrors with existing typical case; Avoid light beam the blocking of transmission course midplane mirror, improved the spectrum utilization ratio.Simultaneously, this system only needs transmitting-receiving integrated fibre bundle common port is carried out the three-dimensional adjustment, thereby has simplified instrument adjustment and centering process in adjustment and centering process, and adjustment process can adopt three-D electric inching structure, can improve automaticity.
[description of drawings]:
Fig. 1 is existing typical DOAS system architecture signal based on the Cassegrain telescope configuration;
Fig. 2 is the transmitting-receiving integrated air difference absorption spectrum of an optical fiber provided by the invention measuring system synoptic diagram;
The transmitting-receiving integrated fiber bundle structure synoptic diagram of Fig. 3.
[embodiment]:
Shown in Figure 2 is the transmitting-receiving integrated air difference absorption spectrum of optical fiber provided by the invention measuring system, and this system comprises pointolite (xenon lamp) 6, telescope and the spectrometer (not drawing among the figure) that can send wide spectral composition.Wherein telescope comprises: spherical reflector 9, and the prism of corner cube 10 of the telescope light path other end.This system also comprises transmitting-receiving integrated fiber bundle structure (as shown in Figure 3) in addition; This fiber bundle structure is made up of launching fiber 12 and reception optical fiber 13; Wherein an end is fixed together becomes transmitting-receiving optical fiber common port 8, and this common port is positioned on the telescope optic axis, and the radius of supposing spherical reflector 9 is R; Then receiving and dispatching the optical fiber common port is 1/2R apart from the distance of spherical reflector, and this transmitting-receiving optical fiber common port can be installed on the existing three-D electric mobile platform and can carry out three-dimensional adjustment.
During detection, the spectrum that is sent by xenon lamp 6 at first gets into the incident port 7 of launching fiber 12 after coupling, by the other end of launching fiber; Promptly receiving and dispatching optical fiber common port 8 penetrates; Spherical reflector 9 collimations in telescope through the atmosphere of one section opening, arrive the prism of corner cube 10 of the telescope light path other end; Reflected along former direction then; The reflected light that carries dusty gas information in the atmosphere returns along former direction, and the spherical reflector in telescope 9 focuses on and gets into transmitting-receiving optical fiber common ports 8 once more, after after receiving another port 11 outgoing of optical fiber 13 the lead-in light spectrometer carry out spectral detection.But spectrometer obtains the concentration of trace gas in the air according to the characteristic absorption spectrum inverting of gas.

Claims (2)

1. the transmitting-receiving integrated air difference absorption spectrum of optical fiber measuring system; This system comprises pointolite, telescope and spectrometer; It is characterized in that this system also comprises the transmitting-receiving integrated structured optical fiber bundle with transmitting-receiving optical fiber common port that is made up of launching fiber and reception optical fiber; After the spectrum that described pointolite sends at first is coupled to an end of the intrafascicular launching fiber of transmitting-receiving integrated structured optical fiber, promptly receives and dispatches the optical fiber common port through the other end of launching fiber and penetrate the spherical reflector collimation in telescope; Atmosphere through one section opening; Arrive the prism of corner cube of the telescope light path other end, reflected along former direction then, the reflected light that carries dusty gas information in the atmosphere returns along former direction; Spherical reflector in telescope focus on to get into transmitting-receiving optical fiber common port once more, after after receiving the outgoing of the optical fiber other end lead-in light spectrometer carry out spectral detection; The intrafascicular transmitting-receiving optical fiber common port of described transmitting-receiving integrated structured optical fiber is positioned on the telescopical optical axis, and the radius of establishing spherical reflector is R, and then receiving and dispatching the optical fiber common port is 1/2R apart from the distance of spherical reflector.
2. the transmitting-receiving integrated air difference absorption spectrum of optical fiber according to claim 1 measuring system is characterized in that the intrafascicular transmitting-receiving optical fiber common port of transmitting-receiving integrated structured optical fiber is installed on the three-dimensional mobile platform and can carries out three-dimensional adjustment.
CN201010238277XA 2010-07-28 2010-07-28 Optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system Expired - Fee Related CN101936885B (en)

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Publication number Priority date Publication date Assignee Title
CN102788763A (en) * 2012-09-03 2012-11-21 四川大学 Difference absorption spectrum atmospheric monitoring system with laser induced breakdown spectrum serving as light source
US10473492B2 (en) * 2014-06-23 2019-11-12 Gwangju Institute Of Science And Technology Optical characteristic measuring apparatus using interrogation optical fiber, optical fiber sensor system having the same, and optical characteristic measuring method
CN106568712B (en) * 2015-07-23 2019-01-15 苏州微纳激光光子技术有限公司 It is a kind of can remote adjustment long light path toxic and harmful gas monitor and its adjusting method
CN105136683A (en) * 2015-07-28 2015-12-09 安徽蓝盾光电子股份有限公司 Long optical path air quality automatic monitoring system with remote quality control function
CN106769738A (en) * 2017-01-18 2017-05-31 西安科技大学 A kind of reflection type optical fiber powder concentration measurement system

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CN2597968Y (en) * 2003-02-20 2004-01-07 中国科学院安徽光学精密机械研究所 Emitting and receiving system of differential absorbing spectrograph for lab.
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CN2597968Y (en) * 2003-02-20 2004-01-07 中国科学院安徽光学精密机械研究所 Emitting and receiving system of differential absorbing spectrograph for lab.
CN101105446A (en) * 2007-01-19 2008-01-16 华南理工大学 Differential optical absorption spectroscopy air quality detection system

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