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An ultra-trace gas concentration detection system

A gas concentration detection and ultra-micro-quantity technology, applied in the field of optical detection, can solve the problems of limited number of reflections and inability to achieve effective strokes, and achieve the effect of increasing the shuttle stroke and meeting the detection requirements

Active Publication Date: 2019-03-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the figure that this method is limited by the size of the spherical mirror, and its reflection times are limited. When measuring trace gases, it still cannot achieve an effective stroke.

Method used

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  • An ultra-trace gas concentration detection system
  • An ultra-trace gas concentration detection system
  • An ultra-trace gas concentration detection system

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] Such as image 3 As shown, an ultra-trace gas concentration detection system includes a light source and its coupling optical path 41, an absorption pool, an interferometer 37 and an infrared detector 39;

[0028] Such as Image 6 As shown, the absorption pool includes a tubular shell 25 sealed at both ends, and a reflection assembly arranged inside the tubular shell 25;

[0029] One of the end faces of the tubular housing 25 is provided with a light incident window 29 and a light exit window 31, and the light incident window 29 and the light exit window 31 are all provided with windows made of infrared wave-transmitting materials; The outside of the window 29 is set opposite to the light source 41, the outside of the light exit window 31 is set opposite to the light entrance of the interferometer 37, and the light exit of the interferometer 37 is set opposi...

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Abstract

The invention belongs to the technical field of optical detection and particularly relates to an ultramicro-gas concentration detection system. The system comprises a light source, a coupling optical path of the light source, an absorbing pond, an interferometer and an infrared detector. The absorbing pond comprises a tubular shell with the two ends sealed, and a reflection assembly arranged in the tubular shell. A right-angle mirror is arranged near the edge of a main mirror, when reflection light deviates from the main mirror, a reflection point on the main mirror side deviates by means of the right-angle mirror to form a new reflection path, and accordingly the reflection stroke is doubled. Thus, the shuttling stroke of infrared light beams is greatly increased, and detection requirements of ultramicro-gas are met.

Description

technical field [0001] The invention belongs to the technical field of optical detection, in particular to an ultra-trace gas concentration detection system. Background technique [0002] In the prior art, a spectrometer is often used to detect the gas concentration. The principle is that when the infrared beam passes through the gas to be measured, the gas will absorb the infrared signal. According to the Lambert-Beer law, the absorbance of gas molecules is proportional to the absorption path, the concentration of gas molecules and the absorption coefficient of gas molecules. Different gas molecules have different gas molecule absorption characteristics. Therefore, the concentration of absorbed gas molecules can be quantitatively retrieved by performing spectral analysis on the absorbance spectrum after gas absorption. However, when the gas concentration is too low, the absorbance of the gas molecules is weak, and the absorption spectrum is not obvious. At this time, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504
CPCG01N21/3504
Inventor 李相贤童晶晶李胜王亚萍石建国陈军高闽光张玉钧刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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