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Detection method for Optical-fiber transmitting infrared absorption type methane gas

A methane gas, infrared absorption technology, applied in color/spectral property measurement, measurement device, material analysis by optical means, etc. Telemetry, simple structure, good consistency

Inactive Publication Date: 2007-09-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to improve the above-mentioned shortcomings of high cost and low practicality of the near-infrared optical fiber detection method based on semiconductor lasers, and provide a detection method for optical fiber transmission infrared absorption methane gas based on a micro-splitter. The detection of methane gas has the characteristics of simplicity, low cost and convenient use

Method used

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  • Detection method for Optical-fiber transmitting infrared absorption type methane gas
  • Detection method for Optical-fiber transmitting infrared absorption type methane gas
  • Detection method for Optical-fiber transmitting infrared absorption type methane gas

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Embodiment Construction

[0019] As shown in Figures 1 to 3, the present invention adopts a broadband infrared light source 1 (which may include temperature control and current control links), a micro-splitter 2 with a blazed grating 13, incident and outgoing optical fibers 3 and 5, an absorption The gas chamber 4, a photodetector 6 and a signal processing circuit 7 form a testing system. The broadband infrared light source 1 controlled by temperature and current outputs a stable light source, and the narrow-band light of a specific wavelength is obtained through the micro-beam splitter 2 and coupled into the incident optical fiber 3. The other end of the incident optical fiber 3 is connected to the spherical lens 8 at the incident end of the absorbing gas chamber 4. The pigtail of the self-focusing lens 9 at the exit end of the absorption gas chamber 4 is connected to the exit fiber 5 , the other end of the exit fiber 5 is connected to the photodetector 6 , and the photodetector 6 is connected to the s...

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Abstract

This invention discloses one fiber transmission infrared absorptive firedamp gas test method based on micro split device, which uses wide band infrared light, flash grating, transmission fiber, absorptive chamber, photo electricity detector and signal process circuit, wherein, the light from LED source to get center wave for 1331 nm thin light source through flash grating into incidence fiber transmission and into absorptive chamber full of firedamp gas; the emit light sends through polymer lens coupled to exit fiber then to photo electricity detector and signal process circuit based on gas infrared absorptive rules of Beer-Lambert gas to get gas chamber gas concentration through testing gas chamber infrared attenuate.

Description

Technical field: [0001] The invention relates to a detection method of methane gas, in particular to an infrared absorption type detection method of methane gas transmitted by optical fiber. Background technique [0002] Methane (CH 4 ) is a flammable and explosive gas, the main component of coal mine gas, methane, and natural gas, and an important chemical raw material. It is explosive when the concentration in the atmosphere is 5.3% to 15%. Gas accidents are one of the main threats to coal mine safety production, and have always been a major problem in the mining industry, bringing huge losses to the country and the people. At the same time, methane is still one of the main components causing the "greenhouse effect", and the long-term corrosion of urban gas pipelines is also a major hidden danger to urban safety. Therefore, the development of a safe, reliable, highly sensitive and intrinsically safe methane detection system has practical and great social significance and...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N21/3504
Inventor 王海容张英蒋庄德周志涛张群明孙国良高鲜妮
Owner XI AN JIAOTONG UNIV
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