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Methane detecting fiber interference process and equipment

A methane detection, all-fiber technology is applied in the field of methane detection using optical fiber couplers, which can solve the problem of high cost and achieve the effects of high sensitivity, high measurement accuracy and high response speed.

Inactive Publication Date: 2007-10-03
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

The device uses multiple fiber gratings as sensing elements, which is a quasi-distributed measurement method, and the cost is relatively high

Method used

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  • Methane detecting fiber interference process and equipment
  • Methane detecting fiber interference process and equipment
  • Methane detecting fiber interference process and equipment

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing the present invention is described in further detail, as shown in Figure 1, broadband light source BBS is connected with ① port of 3dB coupler 1 by optical fiber, and ③ port of coupler 1 is connected with ⑦ port of 3dB coupler 2 by optical fiber A detection arm is formed, and a metal sleeve with a length of 35 mm and an inner diameter of 0.15 mm slightly larger than the diameter of the optical fiber is placed on the detection arm. A layer of platinum film is coated on the surface of the metal sleeve by vacuum coating technology as a catalyst. A polarization controller is provided, and the ④ port of the coupler 1 is connected with the ⑧ port of the coupler 2 through an optical fiber to form a reference arm.

[0020] Under the action of the catalyst, the methane in the gas to be measured undergoes an oxidation reaction with the oxygen in the air to release heat, which increases the temperature near the platinum film, resulting...

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Abstract

The present invention discloses methane detecting fiber interference process and equipment. Two couplers are connected to form one interferometer, which has one detecting arm possessing metal casing coated with platinum film as catalyst and one reference arm. The platinum film catalyzes the oxidation reaction between methane and oxygen to release heat causing the detecting arm to become longer. The light beams the two arms output generate interference effect, and the relation between spectral line shift of the interferometer and the methane concentration is established. The interferometer is connected with a wideband light source and other demodulation equipment to constitute the methane detecting equipment with high sensitivity, high response speed and remote measurement.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a technology for methane detection using an optical fiber coupler. Background technique [0002] Methane (CH 4 ) is the main component of mine gas, natural gas, biogas and various liquid fuels. It is an important industrial raw material and daily life gas. It is also a flammable and explosive gas. The lower limit of explosion in the atmosphere is 5.3%, and the upper limit is 15.0% . It is also considered to be one of the most important gases for the greenhouse effect. CH in air 4 The concentration is increasing at a rate of about 1% per year. Therefore, timely detection of CH 4 The generation source, leakage source and concentration of gas play a very important role in the safe operation of industrial and mining, personal safety and environmental protection. [0003] At present, the widely used methane measurement methods mainly include catalytic oxidation met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/75G01N21/45G06F19/00
Inventor 李丽君曹茂永李晶孙农亮范迪魏朋
Owner SHANDONG UNIV OF SCI & TECH
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