Enhanced multi-group photoacoustic spectrum gas sensing device based on quartz tuning fork

A technology of quartz tuning fork and photoacoustic spectroscopy, which is applied in the directions of measuring devices, color/spectral characteristic measurement, and material analysis, etc. It can solve the problems that are not conducive to obtaining the absolute concentration of gas, achieve easy capture, reduce volume, and realize online self-calibration Effect

Inactive Publication Date: 2015-08-19
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The device realizes the coupling between the light-excited acoustic wave energy and the quartz tuning fork, which can be used to measure the relative concentration of trace gases, but it is not conducive to obtaining the absolute concentration of gases

Method used

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  • Enhanced multi-group photoacoustic spectrum gas sensing device based on quartz tuning fork

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Embodiment

[0033] Such as figure 1 As shown, a multi-component photoacoustic spectroscopy gas sensing device enhanced by a quartz tuning fork includes a laser 1, a fiber amplifier 3, a fiber coupler 4, a collimator 5, a focusing lens 6, a gas cell 10, a reference cell 13, The first detector 14, the second detector 22, the preamplifier circuit module 15, the lock-in amplifier 16, and the signal acquisition and control unit 17; the gas pool 10 is filled with the gas to be measured, and the gas to be measured is CO 2 And NH 3 , The device is used to measure CO 2 And NH 3 concentration;

[0034] The gas cell 10 is equipped with a micro resonance capillary 11 and a quartz tuning fork 12, and the gas cell 10 has a first CaF 2 Window 7, the second CaF 2 Window 23, air inlet 8 and air outlet 9; the first CaF 2 Window 7 is located on the left side wall of gas pool 10, the second CaF 2 The window 23 is located on the right side wall of the gas pool 10; the gas inlet 8 and the gas outlet 9 are both loc...

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Abstract

The invention relates to an enhanced multi-group photoacoustic spectrum gas sensing device based on a quartz tuning fork and belongs to the field of a photoacoustic spectrum detection technology. According to the invention, the quartz tuning fork with high quality factor is used to replace a traditional broadband microphone so as to broaden the dynamic range and realize miniaturization of the whole gas sensing device. By arranging a fiber-optic amplifier between a light source and an optical fiber coupler, laser output power of the light source is increased. Thus, it is easy to capture a weak photoacoustic signal generated by the quartz tuning fork, and detection sensitivity of the gas sensing device can be enhanced.

Description

Technical field [0001] The invention relates to a multi-component photoacoustic spectrum gas sensing device enhanced by a quartz tuning fork, belonging to the technical field of photoacoustic spectrum detection. Background technique [0002] The sensor system for detecting gas concentration is an essential part of urban air monitoring, industrial production monitoring and medical diagnosis. Recently, the quartz-enhanced photoacoustic spectroscopy sensor has attracted attention. It uses a quartz tuning fork as a photoacoustic converter. When the gas absorbs light waves, it generates a weak acoustic pressure wave. This pressure wave excites the quartz tuning fork to resonate and pass the piezoelectric effect. Generate electrical signals. Transimpedance amplifiers are usually used to detect current signals, which are proportional to gas concentration. Experimental research shows that compared with other gas detection technologies, QEPAS technology has the characteristics of high s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/25
Inventor 冯巧玲姜萌魏宇峰梁同利王聪颖
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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