Multi-cavity overlaying type non-resonant photoacoustic cell and gas detection system

Abstract

The invention belongs to the technical field of the detection of trace gas and provides a multi-cavity overlaying type non-resonant photoacoustic cell and a gas detection system. The multi-cavity overlaying type non-resonant photoacoustic cell comprises a cylindrical metal shell, a plurality of non-resonant photoacoustic cavities, a sensitive diaphragm of an optical fiber Fabry-Perot acoustic sensor, an optical glass window piece, an air inlet and an air outlet. The round sensitive diaphragm of the optical fiber Fabry-Perot acoustic sensor is fixed on one side of the cylindrical metal shell, and the other side of the cylindrical metal shell is sealed by virtue of the optical glass window piece. To-be-tested gas enters the air inlet, is dispersed into multiple non-resonant photoacoustic cavities and is discharged from the air outlet at the other side. By virtue of the reduction of the radiuses of the non-resonant photoacoustic cavities and the overlaying of acoustical signals in the non-resonant photoacoustic cavities, the strength of the acoustical signals of the system can be substantially enhance. The diaphragm type Fabry-Perot acoustic sensor is taken as an acoustic detection and can be relatively easily matched with the photoacoustic cavities, so that a novel solution is provided for the detection of multi-component high-sensitivity trace gas.

Description

technical field [0001] The invention belongs to the technical field of trace gas detection, and relates to a multi-cavity superimposed non-resonant photoacoustic cell structure and a high-sensitivity gas detection system based on the photoacoustic cell. Background technique [0002] Trace gas detection has attracted more and more attention in the fields of industrial production process control, environmental monitoring, health detection and dangerous goods detection. With the development of laser technology, spectroscopic technology has become a gas detection method with the advantages of high sensitivity, fast response time and strong selectivity. Photoacoustic spectroscopy is a spectral calorimetry technique that directly measures the heat generated by a gas due to the absorption of light energy. It is a background-free absorption spectroscopy technique. The basic principle of gas photoacoustic spectroscopy is: after the gas to be measured absorbs light energy in a specia...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a multi-cavity superimposed non-resonant photoacoustic cell and gas detection system, aiming to solve the problem of low sensitivity of the traditional non-resonant photoacoustic system

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