CN202083627U - Optical fiber air DOAS measurement system based on Cassegrain telescope structure - Google Patents

Optical fiber air DOAS measurement system based on Cassegrain telescope structure Download PDF

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Publication number
CN202083627U
CN202083627U CN2011201663600U CN201120166360U CN202083627U CN 202083627 U CN202083627 U CN 202083627U CN 2011201663600 U CN2011201663600 U CN 2011201663600U CN 201120166360 U CN201120166360 U CN 201120166360U CN 202083627 U CN202083627 U CN 202083627U
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CN
China
Prior art keywords
optical fiber
cassegrain telescope
doas
light
fiber bundle
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Expired - Fee Related
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CN2011201663600U
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Chinese (zh)
Inventor
魏永杰
耿晓娟
陈文亮
徐可欣
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Tianjin Tongyang Science &Technology Development Co., Ltd.
Hebei University of Technology
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TIANJIN TONGYANG SCIENCE &TECHNOLOGY DEVELOPMENT Co Ltd
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Publication of CN202083627U publication Critical patent/CN202083627U/en
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Abstract

An optical fiber air DOAS (Differential Optical Absorption Spectroscopy) measurement system based on a Cassegrain telescope structure relates to a DOAS air quality monitoring system. The measurement system comprises a point light source, a Cassegrain telescope and a spectrograph, and further comprises an emission optical fiber bundle and a receiving optical fiber bundle. A light spectrum emitted by the point light source is coupled with the emission optical fiber bundle, is emitted out by the emission optical fiber bundle, becomes parallel light rays after passing through an ellipsoidal reflecting mirror and a paraboloidal reflecting mirror in the Cassegrain telescope, then is reflected in the original direction after reaching a pyramidal prism, is focused by the two reflecting mirrors to enter the receiving optical fiber bundle once again, and is finally guided into the spectrograph for spectrum detection after being emitted out by the other end of the receiving optical fiber bundle. Compared with a conventional DOAS system, the optical fiber air DOAS measurement system provided by the utility model adopts one Cassegrain telescope to simultaneously achieve spectrum receiving and transmitting, has a simplified structure, and facilitates instrument regulation and centering.

Description

The air difference absorption spectrum measuring system of optical fiber type Cassegrain telescope structure
[technical field]:
The present invention relates to a kind of differential optical absorption spectroscopy air quality monitoring system, especially measure the monitoring system of trace gas in the air.
[background technology]:
At present, adopt the line sampling instrument can realize the automatic monitor for continuously of air quality, utilize that difference absorption spectrum technology (DOAS) can realize on a large scale, many components, the pollutant in the real time on-line monitoring surrounding air continuously.This method is compared with the point type sampling instrument, and the point type sampling can only be understood 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, and it is less to survey the air pollutants component.Therefore, adopt the monitoring result of DOAS technology to have 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.
At present extensively the DOAS system that adopts is generally based on the mixed structure of Cassegrain telescope and Newtonian telescope.In this structure, the spectrum that is sent by xenon lamp becomes parallel light emergence behind telescopical two catoptrons of Newtonian, light path through hundreds of rice even thousands of meters, after after Optical Fiber Transmission, being surveyed by spectrometer, two focusing mirrors of Cassegrain telescope obtain absorption spectrum by the prism of corner cube reflection that is positioned at the other end.This structure more complicated, bulky, adjust difficulty.Also there is the researcher to adopt other the active or the DOAS structure of passive type, but fails to effectively reduce the instrument volume and simplify adjustment and operation.In actual measurement, brought big difficulty, especially be unsuitable for the field portable formula and measure.
[summary of the invention]:
The objective of the invention is to solve existing DOAS system architecture complexity, bulky, adjust the problem of difficulty, the transmitting-receiving integrated air difference absorption spectrum of a kind of optical fiber measuring system is provided.
The air difference absorption spectrum measuring system of optical fiber type Cassegrain telescope structure provided by the invention comprises pointolite, launching fiber, reception optical fiber, Cassegrain telescope, coupled lens and spectrometer.It is intrafascicular that the spectrum that pointolite sends at first is coupled to launching fiber; The exit end of launching fiber is positioned on the focus of Cassegrain telescope; Emission light is after the exit end of launching fiber penetrates, parabolic mirror in Cassegrain telescope and ellipsoidal mirror reflection, become directional light, atmosphere by one section opening, arrive the prism of corner cube of the Cassegrain telescope light path other end, after prism of corner cube reflection, carry in the atmosphere dusty gas information and return along former direction; The incident end that receives optical fiber also is positioned at the focus of Cassegrain telescope, and the light of returning that is reflected enters reception optical fiber input end through two reflectings surface focusing of Cassegrain telescope once more, carries out spectral detection by lead-in light spectrometer after the other end outgoing.
Described structure adopts a Cassegrain telescope can realize measuring.The incident end of the exit end of described launching fiber and reception optical fiber is positioned on the focus of Cassegrain telescope.
Advantage of the present invention and good effect: the air difference absorption spectrum measuring system of optical fiber type Cassegrain telescope structure provided by the invention, the spectrum transmitting-receiving adopts optical fiber to pass light, the incident end of the exit end of launching fiber and reception optical fiber all is positioned at the focal position of Cassegrain telescope, adopt a decometer plug woods telescope can realize transmitting and receiving light simultaneously, volume is little, simple in structure, easy to adjust, especially is fit to portable type measuring.
[description of drawings]:
Fig. 1 is the air difference absorption spectrum measuring system synoptic diagram of the optical fiber type Cassegrain telescope structure that provides of the embodiment of the invention 1.
[embodiment]:
Embodiment 1
Figure 1 shows that the air difference absorption spectrum measuring system of the optical fiber type Cassegrain telescope structure that present embodiment provides.This system comprises pointolite 1, Cassegrain telescope telescope, prism of corner cube, spectrometer (spectrometer does not draw in the drawings).Wherein Cassegrain telescope comprises: parabolic mirror 8 and ellipsoidal mirror 10.This system also comprises launching fiber 4 and receives optical fiber 5 that in these two fibre bundles, the incident end 7 of the exit end 6 of launching fiber and reception optical fiber is positioned on the focus of Cassegrain telescope.
During detection, the spectrum that is sent by xenon lamp 1 at first enters the incident end 3 of launching fiber 4 after lens 2 couplings, exit end 6 by launching fiber 4 penetrates, become directional light after ellipsoidal mirror 10 in telescope and parabolic mirror 8 reflections, atmosphere by one section opening, the prism of corner cube 11 that arrives the Cassegrain telescope light path other end is reflected, carry returning of dusty gas information in the atmosphere along former direction, parabolic mirror in Cassegrain telescope 8 and ellipsoidal mirror 10 focus on and enter the incident end 7 that receives optical fiber 5 once more, and the lead-in light spectrometer carries out spectral analysis after the other end 9 outgoing through receiving optical fiber 5.But spectrometer obtains the concentration of trace gas in the air according to the characteristic absorption spectrum inverting of gas.

Claims (1)

1. the air difference absorption spectrum measuring system of an optical fiber type Cassegrain telescope structure, this system comprises pointolite, launching fiber, reception optical fiber, Cassegrain telescope, coupled lens and spectrometer, it is characterized in that it is intrafascicular that the spectrum that pointolite sends at first is coupled to launching fiber; The exit ports of launching fiber is positioned on the focus of Cassegrain telescope; Emission light is after the exit end of launching fiber penetrates, parabolic mirror in Cassegrain telescope, become directional light, atmosphere by one section opening, arrive the prism of corner cube of the Cassegrain 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; The incident port that receives optical fiber also is positioned at the focus of Cassegrain telescope, and the light of returning that is reflected enters reception optical fiber input end through two reflectings surface focusing of Cassegrain telescope once more, carries out spectral detection by lead-in light spectrometer after the other end outgoing.
CN2011201663600U 2011-05-23 2011-05-23 Optical fiber air DOAS measurement system based on Cassegrain telescope structure Expired - Fee Related CN202083627U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201663600U CN202083627U (en) 2011-05-23 2011-05-23 Optical fiber air DOAS measurement system based on Cassegrain telescope structure

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Application Number Priority Date Filing Date Title
CN2011201663600U CN202083627U (en) 2011-05-23 2011-05-23 Optical fiber air DOAS measurement system based on Cassegrain telescope structure

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103986523A (en) * 2014-04-28 2014-08-13 西安理工大学 Cassegrain receiving and transmitting integrated antenna based on optical fiber array and receiving and transmitting integrated method
CN104007069A (en) * 2014-05-20 2014-08-27 中国科学院合肥物质科学研究院 Differential optical absorption spectroscopy measurement system based on off-axis paraboloid mirror
CN106066323A (en) * 2016-06-06 2016-11-02 中国科学技术大学 A kind of no color differnece immersion molten metals detecting system
CN109031533A (en) * 2018-07-06 2018-12-18 天津大学 The transceiving integrated antenna of double light path and receiving/transmission method based on Cassegrain telescope
CN112903608A (en) * 2020-12-30 2021-06-04 安徽宝龙环保科技有限公司 Multi-channel long-optical-path telescope system and application thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103986523A (en) * 2014-04-28 2014-08-13 西安理工大学 Cassegrain receiving and transmitting integrated antenna based on optical fiber array and receiving and transmitting integrated method
CN103986523B (en) * 2014-04-28 2016-06-22 西安理工大学 Cassegrain transceiver antenna and transceiver method based on fiber array
CN104007069A (en) * 2014-05-20 2014-08-27 中国科学院合肥物质科学研究院 Differential optical absorption spectroscopy measurement system based on off-axis paraboloid mirror
CN104007069B (en) * 2014-05-20 2017-04-19 中国科学院合肥物质科学研究院 Differential optical absorption spectroscopy measurement system based on off-axis paraboloid mirror
CN106066323A (en) * 2016-06-06 2016-11-02 中国科学技术大学 A kind of no color differnece immersion molten metals detecting system
CN109031533A (en) * 2018-07-06 2018-12-18 天津大学 The transceiving integrated antenna of double light path and receiving/transmission method based on Cassegrain telescope
CN109031533B (en) * 2018-07-06 2020-09-08 天津大学 Dual-light-path receiving and transmitting integrated antenna based on Cassegrain telescope and receiving and transmitting method
CN112903608A (en) * 2020-12-30 2021-06-04 安徽宝龙环保科技有限公司 Multi-channel long-optical-path telescope system and application thereof

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Effective date of registration: 20111115

Address after: 300457, No. 41, No. fifth, Avenue, Binhai New Area Development Zone, Tianjin, No. five, No. 5

Co-patentee after: Hebei University of Technology

Patentee after: Tianjin Tongyang Science &Technology Development Co., Ltd.

Address before: 300457, No. 41, No. fifth, Avenue, Binhai New Area Development Zone, Tianjin, No. five, No. 5

Patentee before: Tianjin Tongyang Science &Technology Development Co., Ltd.

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Owner name: HEBEI UNIVERSITY OF TECHNOLOGY

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Termination date: 20150523

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