WANG Yi1, GUO Li-li2. Research on gas image detection sensor using optical fiber interference cavity[J]. 2010, 29(6): 59-62. DOI: 10.13873/j.1000-97872010.06.002.
Aimed at the difficult problem of infrared absorption gas sensor that the tunable lights is expensive
modulation and demodulation scheme is complex and reliability is low.Mach-Zehnder interferometer with fiber air cavity is adopted to detect gas.The principle is CH4 cause air index of refraction change
interference lights take shape interference stripes on white board by Young’s interference
the parameter of stripe changes proportional to the volume fraction.To analyze change in stripes
information are collected by camera in high-accuracy measurement
gas volume fraction is calculated by image analysis software and proceeds to long-range data transmission by wireless and fiber-optic network.The experiment results show that the method is of high sensitivity and precision
good reliability
so that optical gas sensor can be used widely.
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references
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