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Method and device for detecting concentration of multi-component trace gas

A trace gas, multi-component technology, applied in the field of laser absorption spectroscopy, can solve the problems of inability to obtain qualitative and quantitative results of components, influence of test results, complex components, etc., achieving high reliability, easy operation, and fluctuation of light intensity. small effect

Active Publication Date: 2018-05-08
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electronic nose obtains the overall information of the volatile components in the sample, but cannot obtain the qualitative and quantitative results of various components
If the composition of the sample to be tested is quite complex, it will also have a certain impact on the test results.

Method used

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  • Method and device for detecting concentration of multi-component trace gas
  • Method and device for detecting concentration of multi-component trace gas

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Experimental program
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Embodiment Construction

[0019] as attached figure 1 As shown, the device includes a laser (1), a laser control unit (14), an optical isolator (2), a He-Ne laser (3), a beam combiner (4), a first mirror (5), a second Mirror (6), total reflection mirror (12), polarization coupling mirror (7), 1 / 4 wave plate (8), gas absorption cell (11), photodetector (13), data acquisition card (15), computer (16), acousto-optic modulator (17).

[0020] Firstly, the center wavelength of the laser (1) is set, and the current scanning wavelength of the laser is periodically changed by the laser control unit (14), and the output laser passes through an optical isolator to suppress optical feedback from the resonant cavity. When the ultraviolet or infrared laser is used as the light source, the output light of the 633nm He-Ne laser is used as the indicator light to assist in adjusting the optical path. After being reflected by the beam combining plate, it coincides with the mid-infrared laser projected by the beam combin...

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Abstract

The invention discloses a method and a device for detecting the concentration of a multi-component trace gas by using a laser absorption spectrum technique. The method comprises the following steps: selecting a tunable laser emitter as a light source; according to characteristic absorption spectrum lines of target gas molecules, selecting a measurement waveband; comparing measured data with an HITRAN standard database; performing inversion on a measured concentration by using absorption spectrum signals. The device is simple in structure, simple and convenient to operate and short in responsetime. A total reflective mirror is arranged behind an absorption tank, laser projected through a resonant cavity is reflected and enters the resonant cavity to act with a gas inside the resonant cavity, and the system sensitivity is improved. By changing the emission wavelengths of the laser emitter, various trace gases in a multi-component gas can be precisely detected.

Description

technical field [0001] The invention belongs to the field of laser absorption spectroscopy, in particular to a device for detecting the concentration of trace gases in multi-component gases. Background technique [0002] Trace gas detection is now more and more widely used in various fields, including industrial, environmental, medical, and petroleum, chemical, metallurgical and other hazardous places where flammable, explosive, and toxic gases exist. In recent years, the problem of atmospheric environment has become increasingly prominent. With global warming, the concentration of greenhouse gases in the atmosphere is also increasing. In terms of environmental detection, it is very important to accurately and quantitatively detect trace gases in the atmosphere. [0003] Trace gas detection methods mainly include mass spectrometry, electronic nose, and spectroscopy. Mass spectrometry is very sensitive, capable of detecting very small amounts of analyte molecules. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/396
Inventor 何兴道程涛吴涛
Owner NANCHANG HANGKONG UNIVERSITY
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