Optoacoustic spectroscopy multi-ingredient trace gas detection instrument and method

A trace gas, photoacoustic spectroscopy technology, applied in color/spectral property measurement, instruments, scientific instruments, etc., can solve the problems of difficult simultaneous coupling of mid-infrared thermal radiation light and laser light, low sensitivity of individual gas detection, etc., to meet the reduction requirements , the effect of simplifying the system structure

Inactive Publication Date: 2018-09-14
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose a photoacoustic spectrum multi-component trace gas detection method and instrument, aiming to solve the problem of low detection sensitivity of individual gases and the problem of mid-infrared thermal radiation light in photoacoustic spectroscopy bas

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  • Optoacoustic spectroscopy multi-ingredient trace gas detection instrument and method
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  • Optoacoustic spectroscopy multi-ingredient trace gas detection instrument and method

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Embodiment Construction

[0031] The specific embodiments of the present invention are described in detail below with reference to the technical solutions and the accompanying drawings.

[0032]A photoacoustic spectrum multi-component trace gas detection instrument mainly includes a mid-infrared thermal radiation light source 1, a condenser 2, a chopper 3, a filter group 4, a photoacoustic cell 5, a laser light source 6, and an optical collimator 7 , intake valve 8 , outlet valve 9 , microphone 10 , control and signal processing circuit 11 and touch screen 12 . After the control and signal processing circuit 11 receives the control command input by the touch screen 12, it opens the air inlet valve 8 and the air outlet valve 9, so that the gas to be measured is filled with the photoacoustic cell 5, and the working parameters are set; After the light is focused by the condenser 2, it is modulated by the chopper 3; after the modulated light passes through a filter in the filter group 4, it is longitudinal...

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Abstract

The invention relates to an optoacoustic spectroscopy multi-ingredient trace gas detection instrument and method, and belongs to the technical field of trace gas detection. The instrument comprises amedium infrared heat radiation light source, a light gathering mirror, a chopper, an optical filter plate group, an optoacoustic pool, a laser light source, an optical collimator, an air inlet valve,an air outlet valve, a microphone, a control and signal processing circuit and a touch screen, wherein the medium infrared heat radiation light source is longitudinally coupled to the optoacoustic pool after the light gathering; the optoacoustic signals are measured by using the intensity modulation-base wave detection technology; the laser is coupled into the optoacoustic pool from the side surface and is reflected for many times on the surface of the pool wall; the optoacoustic signals are measured by using a wave-length modulation-second harmonic detection technology; the background noise interference is greatly reduced. The advantages, suitable for multi-ingredient gas measurement and realizing high detection sensitivity, of the optoacoustic spectroscopy method of the medium infrared heat radiation light source and the laser optoacoustic spectroscopy method are sufficiently used; the technical complementation is realized; the technical scheme with good competitiveness is provided for the high-sensitivity detection of the multi-ingredient trace gas.

Description

technical field [0001] The invention belongs to the technical field of trace gas detection, and relates to a photoacoustic spectrum multi-component trace gas detection instrument and method. Background technique [0002] Photoacoustic spectroscopy multi-component trace gas detection technology has obvious advantages such as high sensitivity, fast measurement speed, long working life and small sampling volume. It plays an important role in applications such as analysis and monitoring of flammable and explosive gases in coal mines. [0003] Photoacoustic spectroscopy is a spectral calorimetry technique that directly measures the heat generated by gas due to absorption of light energy, and is a background-free absorption spectroscopy technique. According to different photoacoustic excitation light sources, photoacoustic spectroscopy is mainly divided into photoacoustic spectroscopy based on mid-infrared thermal radiation light source and laser photoacoustic spectroscopy. The ...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/39
CPCG01N21/01G01N21/39
Inventor 陈珂于清旭
Owner DALIAN UNIV OF TECH
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