Device and method for improving performance of photoacoustic spectrometry sensor based on H-shaped resonance tube

Abstract

The invention discloses a device and a method for improving the performance of a photoacoustic spectrometry sensor based on an H-shaped resonance tube. The device comprises a semiconductor laser, a laser alignment system, an air chamber, an H-shaped resonance tube, a quartz tuning fork, a rectangular prism, an impedance amplifier, a control and data acquisition system and a computer. The H-shapedresonance tube comprises two transverse tubes and a longitudinal tube. The midpoint positions of the first transverse tube and the second transverse tube are communicated through the longitudinal tube, and two openings are formed in the midpoint position of the longitudinal tube. The quartz tuning fork and the H-shaped resonance tube are placed in a gas chamber containing gas to be detected. The longitudinal tube penetrates through a fork strand gap of the quartz tuning fork, and two opening positions of the longitudinal tube are aligned with two fork strands of the quartz tuning fork. The quartz photoacoustic spectrometry trace gas sensor solves the problem of low performance improvement of the quartz photoacoustic spectrometry trace gas sensor by the common acoustic resonance tube at present, can improve the signal by 1800 times, and has the advantages of high amplification factor, low cost, small size and the like.

Description

technical field [0001] The invention relates to a device and a method for improving the performance of a photoacoustic spectrum sensor, in particular to a device and a method for improving the performance of a photoacoustic spectrum sensor based on an H-shaped resonant tube. Background technique [0002] The photoacoustic spectroscopy technology based on the quartz tuning fork is a highly sensitive trace gas detection method. The quartz tuning fork is placed in the gas chamber filled with the target gas, the tunable laser passes through the gas chamber and excites the gas to be measured, and the gas absorbs the laser energy Finally, a sound wave is generated. Using the piezoelectric effect of the quartz tuning fork, the tuning fork converts the sound signal into an electrical signal, and the concentration of the gas is reversed by demodulating the amplitude of the electrical signal. In order to further improve the detection performance of the system, an acoustic resonance tu...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the currently commonly used acoustic resonance tube improves the performance of the quartz photoacoustic spectrum trace gas sensor, the present invention uses the secondary amplification of the sound wave to provide a H-shaped resonance tube to improve the performance of the photoacoustic spectrum sensor. Apparatus and method

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