Various Gas Concentration Sensors Based on Fiber Bragg Gratings
A Bragg grating, gas concentration detection technology, applied in instruments, scientific instruments, material analysis by optical means, etc., to achieve the effect of a wide range of applicable environments and a good foundation for technological transformation
Active Publication Date: 2016-05-11
TIANJIN UNIV
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However, so far there is no FBG sensor for gas concentration detection based on the principle of infrared absorption
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[0027] The sensor for detecting the concentration of various gases based on the fiber Bragg grating of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.
[0028] The sensor for detecting various gas concentrations based on fiber Bragg gratings of the present invention includes an optical fiber core 1, and a section of the optical fiber core 1 is respectively formed with a first optical fiber cloth for detecting changes in optical signals. Ragg grating 2 and a second fiber Bragg grating 3 for detecting a reference optical signal, the fiber core 1 is located at the position corresponding to the first fiber Bragg grating 2 and the second fiber Bragg grating 3 The outer sides are each wrapped with a layer of absorbing film 5 capable of absorbing light signals, and the absorbing film 5 is a CuO film. The entire section of the optical fiber core 1 wrapped with the absorbing film 5 is set in a protective shell 6 w...
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Abstract
The invention discloses a fiber Bragg grating-based sensor for detecting multiple gas concentrations. The sensor comprises an optical fiber core, wherein a first fiber Bragg grating used for detecting light signal change and a second fiber Bragg grating used for detecting a reference light signal are respectively formed in one section of the optical fiber core at interval; for the optical fiber core, the outer sides corresponding to the first fiber Bragg grating and the second fiber Bragg grating are coated with absorption films which can absorb the light signals; the overall section of the optical fiber core, coated with the absorption film, is arranged in a protective shell at the upper end in which an opening is formed; a first light filter of which the transmission wavelength is signal light is arranged on the upper side, which corresponds to the first fiber Bragg grating, of the upper opening of the protective shell; a second light filter of which the transmission wavelength is reference light is fixedly arranged on the upper side corresponding to the second fiber Bragg grating. The sensor is completely suitable for strong electromagnetic, flammable and combustible environments and can be widely applied to industrial occasions or dangerous fields at which the concentrations of various harmful gases need to be detected.
Description
technical field [0001] The invention relates to a gas concentration sensor. In particular, it relates to a multi-gas concentration sensor based on fiber Bragg gratings, which uses optical signals instead of electrical signals. Background technique [0002] Gas concentration is an important parameter that requires real-time monitoring and analysis in many fields. The monitoring of gas concentration is used in various fields such as environmental protection, sanitation and epidemic prevention, industrial process analysis and control, medical diagnosis, and aerospace life insurance. In recent years, with the enhancement of people's awareness of environmental protection and the progress of scientific and technological development, how to quickly detect the content of gas, reduce the emission of toxic and harmful gases, and control the emission of toxic and harmful gases in agriculture and industry has become an important issue for governments at all levels. Therefore, it is of ...
Claims
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IPC IPC(8): G01N21/3518
Inventor 贾大功陈志童张红霞刘铁根张以谟
Owner TIANJIN UNIV