A non-resonant photoacoustic spectroscopy system

A photoacoustic spectroscopy, non-resonant technology, applied in the field of non-resonant photoacoustic spectroscopy systems, can solve problems such as large noise at the same frequency, and achieve the effects of increasing beam power, optimizing convergence effect, and reducing light distribution and proportion.

Active Publication Date: 2021-06-29
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a non-resonant photoacoustic spectroscopy system, which aims to solve the problem of large same-frequency noise in the existing non-resonant photoacoustic spectroscopy system

Method used

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  • A non-resonant photoacoustic spectroscopy system

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Embodiment 1

[0034] Such as figure 1 As shown, the embodiment of the present invention provides a non-resonant photonic sound spectroscopy system, including an ellipsoid-type reflective cover 1, an infrared wide-spectral light source 2, a chopper 3, a filter wheel 4, a photocoupless front window 5 , Micro-tone 6, light sound cell rear window 7, amplifier optical sound cell 8, intake port 9, air outlet 10.

[0035] The infrared broad spectrum light source 2 transmits a broadband light, and the ellipsoid-type reflective cover 1 is transmitted; the chopper 3 is mechanically modulated, and the light other than the gas band is filtered by the filter wheel 4; The front window 5 is injected from the back window 7 of the photocoyum pool; the gas to be tested is discharged from the intake port 9, and the gas molecule absorbs the infrared light in the light sound cell, and the radiation generates thermal energy, under a specific modulation frequency The sound wave signal is generated, and the processing...

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Abstract

The invention discloses a non-resonant photoacoustic spectrum system, which belongs to the technical field of gas detection. It includes an infrared wide-spectrum light source, a reflector, a modulation and filter unit, a photoacoustic pool, and a microphone; the photoacoustic pool is an enlarged structure, and its cavity cross-sectional diameter increases along the light direction, and includes a front window and a Rear window; a reflector, used for reflecting and converging the light emitted by the infrared broad-spectrum light source to the center of the rear window. When the wide-spectrum light source is placed at the left focus point, the light can be effectively converged at the center of the rear window of the photoacoustic pool, and the convergence effect can be optimized under the condition of maintaining better beam collimation, so that the overall spatial distribution of the beam is reasonable, and the incident light into the photoacoustic pool is improved. The beam power; the amplification ratio of the enlarged photoacoustic cell matches the shape parameters of the reflector to minimize the distribution and proportion of the light beam hitting the inner wall of the photoacoustic cell, and reduce the same-frequency noise caused by the absorption of light by the cell wall. Improve system signal-to-noise ratio and detection limit.

Description

Technical field [0001] The present invention belongs to the field of gas detection, and more particularly to a non-resonant photonic sound spectroscopy system. Background technique [0002] The photocoya spectrum is a spectral technique based on the photonic sound effect. In the photonic sound effect, the gas molecule absorbs the infrared light of a particular wavelength and is excited to high energy, and the molecules in high energy will be absorbed in the form of no radiation transition. It can be converted to the low energy state after the heat energy is returned, and the frequency modulation of the incident light will present the same periodic change as the modulation frequency to generate sound waves, and the sound signal is detected by the microcontroller and calculates the final concentration of gas. . [0003] The photonic spectrum gas detection system is divided into resonant and non-resonant types in accordance with the working mode: the resonant photonic spectroscopy s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17G01N21/01
CPCG01N21/01G01N21/1702G01N2021/0112G01N2021/1704
Inventor 司马朝坦汪超林肖扬帆邓柏涛龙彦宏鲁平刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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