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Gas concentration detection method and equipment based on optical fiber laser intracavity sensitivity

A technology of gas concentration detection and fiber laser, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of unfavorable sensor integration and packaging, and achieve a solution suitable for distributed solutions, increased effective cavity length, and enhanced long-distance transmission capabilities Effect

Inactive Publication Date: 2008-11-12
ZHEJIANG UNIV
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Problems solved by technology

The above methods often need to use geometric optics to increase the travel of light in the gas to be measured to improve measurement accuracy, which is very unfavorable for sensor integration and packaging

Method used

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  • Gas concentration detection method and equipment based on optical fiber laser intracavity sensitivity
  • Gas concentration detection method and equipment based on optical fiber laser intracavity sensitivity

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Embodiment Construction

[0019] Taking the detection of carbon dioxide concentration as an example, the spectral absorption peak position of carbon dioxide gas in the optical communication band is selected to be 1538 nanometers, and two fiber Bragg gratings with a reflection peak position of 1538 nanometers and a reflectivity of 99% are designed and manufactured.

[0020] Such as figure 1 and 2 As shown, one is placed in the air chamber 6 and has a diameter of 2 microns and a length of 10 centimeters. The two ends of the tapered fiber 5 are respectively optically connected with the erbium-doped optical fiber 4 and 7. The erbium-doped optical fiber 4 and 7 The other end is respectively provided with fiber Bragg gratings 3 and 8. The pump source 1 with a wavelength of 980 nanometers is optically connected to a fiber Bragg grating 3 through a one-way isolator 2, and the photodiode 9 is optically connected to another fiber Bragg grating 8.

[0021] The DFB laser with a wavelength of 980 nm works, and the...

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Abstract

A method for detecting concentration of gas sensitive in optical fiber laser cavity includes using 980 nanolaser as pumping source and using optical fiber Bragg grating to structure feedback cavity, obtaining gas concentration by measuring output light power of linear cavity optical fiber laser based on fact that light energy transmitted in conical optical fiber can form evanescent field trail in outside air and light energy loss is sensitive to concentration of certain gas.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a sensitive gas concentration detection method and equipment based on a linear cavity fiber laser cavity. Background technique [0002] With the advancement of science and technology and the development of industrialization, the pollution of the human living environment is also increasing. Air pollution is one of the most serious problems. There are various harmful, toxic, flammable and explosive gases in the living environment of people. , From household flammable gases to various harmful gases emitted by industry and transportation, and even the culprit methane that frequently causes explosions in coal mines, high-precision gas sensors are required for measurement. [0003] Compared with other gas sensors, fiber optic gas sensors have the following advantages: (1) suitable for long-distance online measurement; (2) suitable for measuring flammable and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 管祖光陈达如何赛灵
Owner ZHEJIANG UNIV
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