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Gas detecting method and gas sensor based on plane annular micro-cavity

A ring-shaped microcavity and gas detection technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as difficult control of absorption optical path, detection constraints, and inability to measure gas concentration quickly and accurately, achieving strong scalability and real-time Effect of detecting and saving diffusion time

Inactive Publication Date: 2009-04-29
ZHONGBEI UNIV
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Problems solved by technology

It is not easy to control the absorption optical path in the process of deriving the gas concentration using the "Beer-Lambert" theorem. When the concentration of the gas to be measured is very low, this detection method cannot quickly and accurately measure the gas concentration
Therefore, its detection is restricted by the concentration of the gas to be measured

Method used

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  • Gas detecting method and gas sensor based on plane annular micro-cavity
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  • Gas detecting method and gas sensor based on plane annular micro-cavity

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Embodiment Construction

[0020] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] The present invention is based on the gas sensor of planar annular microcavity and tapered optical fiber structure, comprises optical fiber, laser emitter 4, optical filter 5, beam splitter 6, absorption gas chamber 7, vacuum chamber 8, photodetector 9 and signal Processor 10;

[0022] The optical fiber is a double-tapered optical fiber; each of the absorption chamber and the vacuum chamber has a coupler composed of a planar annular microcavity and a biconical optical fiber, and the planar annular microcavity of the coupler is located in the described The tapered region of bitapered fiber, such as figure 1 and figure 2 shown. The coupler in the absorption gas chamber is a detection gas coupler, and the coupler in the vacuum chamber (8) is a coupler in a vacuum environment.

[0023] ●The absorption gas chamber is composed of a detection gas ...

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Abstract

The invention relates to a gas detection method and a gas sensor based on planar annular microcavities. The method is mainly characterized in that two couplers consisting of the planar annular microcavities and biconical optical fibers are adopted, one is a gas detection coupler, and the other is a coupler in a vacuum environment. The gas detection method comprises the following steps: based on a principle that the absorption effect of evanescent wave on different gases changes the peak value of a transmitted spectrum, a transmitted spectrum of the gas detection coupler of gas to be detected and a transmitted spectrum of the coupler in the vacuum environment are utilized to contrast; and the detection of the variety and the concentration of the gas to be detected is realized through spectral changes of the transmitted spectrums. The gas sensor designed by the method has the advantages of short response time, relatively simple structure, extremely high sensitivity to virulent harmful gas with extremely low concentration and so on.

Description

1. Technical field [0001] The invention belongs to a method sensor for detecting gas with an optical signal, in particular to a gas detection method and a gas sensor based on a planar annular microcavity. 2. Background technology [0002] With the development of society and the progress of industry, especially the development of petroleum, coal, automobile industry and chemical industry, the types and quantities of gases emitted in life and industry are increasing day by day. Therefore, the detection of gas concentration and species is of great significance in production and life. Such as the detection of gas in coal mines and mines; the detection of harmful chemical gases in chemical workshops; the detection of harmful gases in interior decoration, etc. Especially harmful and highly toxic gases, a small amount in the air will cause great harm to the human body and even threaten life. For example: Arsine is a highly toxic gas, and when its concentration reaches 0.5 mg per ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 熊继军严英占闫树斌杨玉华吉喆王少辉王宝花姜国庆任小红
Owner ZHONGBEI UNIV
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