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Methane distribution type sensing method and equipment based on optical fiber Bragg grating

An optical fiber Bragg and sensing method technology, applied in the field of optical fiber sensing, can solve the problems of difficult measurement, poor integration, hidden safety hazards, etc., and achieve the effects of strong anti-electromagnetic interference ability, simple structure, and convenient installation.

Inactive Publication Date: 2006-06-28
ZHEJIANG UNIV
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Problems solved by technology

This method generally can only achieve a measurement accuracy of 0.1%, and the circuit part is easily affected by external electromagnetic interference, which affects the measurement accuracy; due to the need for power supply, there is a potential safety hazard of electric sparks; this method is not conducive to the realization of distributed sensing
Another spectral absorption method uses the Lambert-Beer law to determine the gas concentration by measuring the loss of light energy of a specific wavelength by methane. This method has a high measurement accuracy, but due to the need to increase the optical path to Improve the measurement sensitivity, so the integration is relatively poor, and it is very difficult to realize distributed measurement

Method used

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  • Methane distribution type sensing method and equipment based on optical fiber Bragg grating
  • Methane distribution type sensing method and equipment based on optical fiber Bragg grating

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Embodiment Construction

[0018] Such as figure 1 , select a group of fiber Bragg gratings 4 whose reflection peak wavelength positions are separated by 3 nanometers to be connected in series; use vacuum coating technology to coat a layer of 3 micron platinum film 3 on the surface of each fiber Bragg grating 4 as a catalyst. Under the action of the catalyst, methane in the gas to be measured reacts with oxygen in the air to release heat, which increases the temperature near the platinum film 3 and causes the position of the reflection peak of the fiber Bragg grating 4 to shift. Broadband light source 1 covering all fiber Bragg grating reflection peak wavelengths is connected to port ① of circulator 2 through optical fibers, and port ② of circulator 2 is connected to a group of fiber Bragg gratings 4 coated with platinum film 3 through optical fibers. The ③ port of the device 2 is connected with the fiber Bragg grating wavelength division multiplexing demodulation system 5 through an optical fiber.

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Abstract

A method for sensing methane in distribution mode based on optical fiber Bragg grating includes coating Pt film with thickness of 1 ¿C 5 micron on said Bragg grating, using metal Pt as catalyst to catalyze methane in outside air and to carry out oxidation reaction with oxygen for converting chemical energy to be heat energy so as to change reflection peak position of said Bragg grating in following change of temperature, confirming methane concentration in gas to be tested by confirming wavelength of reflection peak.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a methane distributed sensing method and equipment based on optical fiber Bragg gratings. Background technique [0002] Methane is widely used in daily life and industrial production. For example, biogas, natural gas and household gas all contain methane. At the same time, it is also a flammable and explosive gas. If the concentration in the air exceeds 5.9%, it will easily cause an explosion. The "Coal Mine Safety Regulations" clearly stipulates that multi-point, real-time and high-precision monitoring of methane content in coal mines is required. [0003] The existing widely used methane measurement methods mainly include catalytic oxidation method and spectral absorption method. Among them, the catalytic oxidation method uses a catalyst to catalyze the oxidation reaction of methane and oxygen, converts chemical energy into heat energy, and measures t...

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Application Information

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IPC IPC(8): G01N21/75G01K11/3206G01N21/17G01N25/20
Inventor 管祖光陈达如何赛灵
Owner ZHEJIANG UNIV
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