Trace gas measurement device and method with adoption of photo-acoustic spectroscopy

A technology of trace gas and photoacoustic spectroscopy, which is applied in measuring devices, color/spectral characteristic measurement, and material analysis through optical means, and can solve problems such as noise

Inactive Publication Date: 2016-01-20
ANHUI WAYEE SCI & TECH CO LTD
View PDF0 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a photoacoustic spectrum trace gas measurement device and method to solve the problem of noise generated by the absorption of windows and cell walls in the gas concentration measurement device based on photoacoustic cells in the prior art

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
  • Trace gas measurement device and method with adoption of photo-acoustic spectroscopy
  • Trace gas measurement device and method with adoption of photo-acoustic spectroscopy
  • Trace gas measurement device and method with adoption of photo-acoustic spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Such as figure 1 , Figure 4 As shown, a photoacoustic spectrum trace gas measurement device includes a light source, a photoacoustic cell, a chopper, a preamplifier, a lock-in amplifier, a digital signal processing unit, and an optical power meter. The inner cavity of the photoacoustic cell is composed of Two photoacoustic cavities are coaxially connected, and three buffer gas chambers 1, 2, and 3 are formed in the photoacoustic pool, which are coaxial with the photoacoustic pool and located at the front, rear and middle positions of the photoacoustic pool, and connected with the photoacoustic pool. The two first-order longitudinal resonant resonators 4 and 5 are coaxial and connected to the adjacent buffer gas chamber. The lengths and radii of the two resonators 4 and 5 are different, but they have the same resonant frequency. It is vertically connected to the sound holes 6 and 7 at the middle points of the resonant cavities 4 and 5, and the sound holes 6 and 7 are r...

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
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a trace gas measurement device and method with adoption of photo-acoustic spectroscopy. A photo-acoustic cell with a double-resonant-cavity structure is used for measurement, two resonant cavities have different lengths and radiuses but have the same resonance frequency, and the same to-be-measured gas enters the two resonant cavities from buffer gas chambers in two ends of the photo-acoustic cell and flows out from a buffer gas chamber between the two resonant cavities. The concentration of the gas is measured indirectly through differential resonance photo-acoustic signals of the two resonant cavities, the influence of related noise caused by a photo-acoustic effect in solids can be reduced obviously, the detecting signal to noise ratio of the photo-acoustic signals is increased, and the detection limit of the trace gas can be further improved.

Description

technical field [0001] The invention relates to the field of gas concentration measurement systems, in particular to a photoacoustic spectrum trace gas measurement device and method. Background technique [0002] Spectral detection technology is divided into emission spectroscopy technology and absorption spectroscopy technology. Photoacoustic spectroscopy (photo-acoustic spectroscopy), like differential absorption spectroscopy (DOAS), belongs to absorption spectroscopy technology and is a kind of indirect absorption spectroscopy technology. Photoacoustic spectroscopy, characterized by high sensitivity and selectivity, is an important limit detection method. [0003] The basic principle of photoacoustic spectroscopy technology is based on the photoacoustic effect, that is, when a beam of light close to the absorption frequency of the gas to be measured intermittently irradiates the gas in a closed container, there will be sound waves in the container. This phenomenon is call...

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): G01N21/17G01N21/25
Inventor 刘洋
Owner ANHUI WAYEE SCI & TECH CO LTD
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