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New-type gas detection system based on fiber interferometer

A gas detection system and optical fiber interferometer technology, which is applied to the coupling of optical waveguides and the measurement of phase influence characteristics.

Inactive Publication Date: 2012-05-30
SHANDONG UNIV
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Problems solved by technology

However, this detection technology is easily affected by the environment, which seriously affects the accuracy of measurement.

Method used

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  • New-type gas detection system based on fiber interferometer
  • New-type gas detection system based on fiber interferometer

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Embodiment

[0020] Examples of the present invention figure 1 As shown, it consists of a semiconductor laser (1), an isolator (2), a 1*2 coupler (3), a gas chamber, an ordinary optical fiber and a phase demodulation system, and is characterized in that the pigtail of the semiconductor laser (1) is connected The isolator (2), the output end of the isolator (2) is connected with the common fiber (6), the other end of the common fiber (6) is connected with the input end of the 1*2 coupler (3), the 1*2 coupler The two co-directional output ends of (3) are respectively connected with two ordinary optical fibers (7), (8), and one of the ordinary optical fibers (8) is connected in series with the air chamber (4); the two ordinary optical fibers (7), The output end of (9) is connected to the phase demodulation system (5), and the optical phase difference of the two beams of light output by the two ordinary optical fibers (7) and (9) is measured through the phase demodulation system (5), and the o...

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Abstract

The invention discloses a new-type gas detection system based on a fiber interferometer, which belongs to the gas detection technical field, is composed of a semiconductor laser, an isolator, 1*2 coupler, a gas room, common optical fibers and a phase demodulating system, and is characterized in that a tail optical fiber of the semiconductor laser is accessed into the isolator; the output end of the isolator is connected with the common optical fiber; the other end of the common optical fiber is connected with the input end of the 1*2 coupler; the two same directional output ends of the 1*2 coupler are respectively connected with two common optical fibers; one of the common optical fiber is in series connection with the gas room; the output ends of the two common optical fibers are connected with the phase demodulating system; the optical phase difference of two beams output by two-path common optical fibers is detected by the phase demodulating system to indirectly calculate the gas refractive index, and further calculate the gas concentration. The gas detection system of the invention has the advantages of radiation resistance, corrosion resistance and electromagnetic interference resistance, and capability of safely operate in harmful environment, and being not influenced by the environment.

Description

technical field [0001] The invention relates to a gas detection system, in particular to a novel gas detection system based on an optical fiber interferometer. Background technique [0002] Environmental pollution is the focus of worldwide attention in recent years. Among all kinds of environmental pollution, air pollution is the most prominent. With the rapid development of modern industrial society, the harmful gases such as carbon dioxide and sulfur dioxide in the atmosphere are increasing day by day. How to make accurate quantitative analysis of these gas components is imminent. [0003] At present, the gas detection technology at home and abroad is developing rapidly, and the detection methods also vary with the different objects to be measured. At present, there are about 100 kinds of atmospheric pollutants that have been recognized, and these pollutants exist in the atmosphere in the form of molecules and particles. At present, the methods of optical detection of ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45G02B6/26
Inventor 常军王宗良王伟杰宋复俊孔德龙张燕
Owner SHANDONG UNIV
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