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
View PDF3 Cites 17 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for detecting concentration of multi-component trace gas
  • Method and device for detecting concentration of multi-component trace gas

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
reflectanceaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap