Single-light-source CARS (coherent antistockes Raman spectroscopy) gas detection device and method

A gas detection, single light source technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of difficult maintenance and high cost, and achieve the effects of improving detection accuracy, reducing maintenance difficulty, and reducing system complexity

Active Publication Date: 2015-11-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the high cost and difficult maintenance of the current CARS detection technology, a CARS gas detection system with a single light source is proposed to detect Raman active gases

Method used

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  • Single-light-source CARS (coherent antistockes Raman spectroscopy) gas detection device and method

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Experimental program
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Effect test

Embodiment 1

[0018] Using the present invention to detect CH in the mixed gas pipeline produced by coal dry distillation 4 concentration of the gas.

[0019] Using the 532nm laser output by the frequency-doubled YAG laser as the light source, first fill the Raman cell with pure 2MPa pure CH 4 Gas, fill the pipeline of mixed gas to be tested with 1 atmosphere of pure CH 4 For gas, the 532nm pump laser is focused by the focusing lens 2 in the Raman cell 3 of the target gas, and the generated Stokes light has a wavelength of 629.7nm. The beam splitter 4 reflects about 3% of the pump laser light and the Stokes light onto the dichroic mirror 5, wherein the pump light passes through the dichroic mirror 5 and irradiates the pump light detector 6, and the Stokes The Stokes light is incident on the Stokes photodetector 7 after being reflected by the dichroic mirror 5, and the remaining part of the pump light and the Stokes light generated in the Raman cell are confocalized on the waiting spot thr...

Embodiment 2

[0024] Adopt the present invention to detect the O in the tail gas that certain experimental device produces 2 gas concentration.

[0025] Using the 532nm laser output by the frequency-doubled YAG laser as the light source, first fill the Raman cell with pure 5MPa pure O 2 Gas, fill the pipeline of the mixed gas to be tested with 1 atmosphere of pure O 2 For gas, the 532nm pump laser beam is focused on the target gas Raman cell 3 through the focusing lens 2, and the generated Stokes light has a wavelength of 580nm. The beam splitter 4 reflects about 2% of the pump laser light and the Stokes light onto the dichroic mirror 5, wherein the pump light passes through the dichroic mirror 5 and irradiates the pump light detector 6. The Stokes light is incident on the Stokes photodetector 7 after being reflected by the dichroic mirror 5, and the remaining part of the pump light and the Stokes light generated in the Raman cell are confocalized on the waiting spot through the focusing ...

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Abstract

The invention provides a single-light-source CARS (coherent antistockes Raman spectroscopy) gas detection system, which relates to Raman active gas real-time on-line or off-line detection. The single-light-source CARS gas detection system adopts a CARS technology; a single pumping laser can be adopted to be used as a light source; a part of the pumping laser is converted into Stocks light through Raman scattering in a target gas Raman pool; the rest part is used as pumping light and detection light; the pumping light and the detection light and the Stocks light are simultaneously focused in the same position in the target gas pool to be detected; CARS signal light is generated in a confocal part of the pumping light, the detection light and the Stocks light. The technical scheme has the advantages that one laser can be adopted for obtaining the CARS signal of the gas to be detected, and the cost and the system complexity degree can be effectively reduced. In addition, the high-pressure target gas is adopted for filling the Raman pool, and the wavelength of the generated Stocks light can precisely meet the detection requirements, so that the stocks light wavelength calibration like an ordinary CARS technology is not needed, the maintenance difficulty can be reduced, and the detection precision is improved.

Description

technical field [0001] The present invention is a single light source CARS gas detection system, which is related to real-time on-line or off-line detection of Raman active gases. The detection of gases with Raman activity reduces system complexity and saves system cost. Background technique [0002] As an important technology for gas detection, CARS spectroscopy (Coherent Anti-Stokes Raman Scattering) technology has played a huge role in the fields of industrial production, environmental monitoring and national defense technology. The currently used CARS spectroscopy technology mostly uses two or more laser light sources, one of which is used as pump light, and the other laser (usually produced by dye laser or OPO) is used as Stokes light. Depending on the situation, it may be repeated One laser beam is used as the probe light (or the pump light doubles as the probe light), so at least two lasers or at least one laser and one OPO are required to provide input laser light. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 郭敬为刘金波蔡向龙盖宝栋石喆金玉奇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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