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Terahertz gas detection system and method based on photoacoustic resonance detection

A gas detection system and terahertz technology, applied in the field of terahertz gas detection systems, can solve the problems of low thermal radiation absorption conversion rate, narrow bandwidth, poor sensitivity, etc., and achieve improved detection sensitivity, low equivalent noise power, and low operating frequency wide range of effects

Active Publication Date: 2020-08-28
HEBEI UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a terahertz gas detection system and method based on photoacoustic resonance detection to solve the problems of low thermal radiation absorption conversion rate, narrow bandwidth and poor sensitivity of existing terahertz coherent measurement technology

Method used

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  • Terahertz gas detection system and method based on photoacoustic resonance detection

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Embodiment 1

[0032] Such as figure 1 and figure 2 As shown, the present invention proposes a gas detection system and method based on terahertz waves and photoacoustic resonance detection. The specific structure includes:

[0033] White gas pool 7, it is long and is 130cm, is wide and is 110cm, and height is the hollow airtight chamber of glass material of 30cm, has four highly reflective concave mirrors 8 of diameter 10cm in the chamber, can carry out multiple times to the light beam in the chamber Reflection, thereby increasing the optical distance, after reflection, the optical distance is 3m. Terahertz lens windows 4 are provided on opposite side walls of the cavity, and an air inlet 9 for gas entry, an air outlet 6 for gas discharge, and a pressure monitoring port 15 are also provided on the side walls of the cavity. Check valves are provided at the air inlet 9, the air outlet 6 and the pressure monitoring port 15. There is a gas pressure sensor at the pressure monitoring port 15,...

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Abstract

The invention provides a terahertz gas detection system and a terahertz gas detection method based on photoacoustic resonance detection. The terahertz gas detection system comprises a White gas cell,a terahertz device, a microneedle quartz tuning fork system, a signal processing system and a control system. According to the terahertz gas detection system, a terahertz absorption substance is usedas a photoacoustic conversion device to generate a photoacoustic effect and surface micro-displacement, and then the micro-needle cantilever beam tuning fork and a lock-in amplifier are used for realizing photoacoustic signal intensity detection, so that the measurement of broadband terahertz wave transmission intensity is realized, and the precision and sensitivity of gas concentration detectionare improved.

Description

technical field [0001] The invention relates to the technical field of gas spectrum detection, in particular to a terahertz gas detection system and method based on photoacoustic resonance detection. Background technique [0002] Gas detection technology has been developed for a long time. Infrared detection technology uses infrared light as a light source to irradiate the gas to be measured. The light absorbed by the gas causes the transmitted light intensity to attenuate. The concentration of the gas to be measured can be calculated by Lambert-Beer's law. The direct absorption method has a short optical path and poor measurement accuracy. In order to increase the interaction distance between gas and laser, White cell, Heriott cell and differential absorption spectroscopy have appeared one after another, and the detection sensitivity has been improved. As a high-sensitivity trace gas detection technology, photoacoustic spectroscopy has developed greatly in recent years. Th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/3581G01N21/3504G01N21/01G01H11/08
CPCG01N21/1702G01N21/3581G01N21/3504G01N21/01G01H11/08G01N2021/1704G01N2021/1708
Inventor 刘秀玲娄存广侯凯旋王鑫荆聪蕊张建涛陈弘家
Owner HEBEI UNIVERSITY
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