| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 90 === This system is designed to detect the leakage position of gas pipelines. By Sagnac
interferometric theory, we develop the hybrid configuration of Mach-Zehnder and Sagnac Interferometer. It contains the properties of Sagnac Interferometer and it is easy to spread the fiber on the pipelines. When the leakage happened, it will generate the sound signal. This kind of sound pressure will make the total fiber length changed, and hence it will make phase difference. By getting the phase difference, we will get the information of leakage position. After a series of experiments, we prove our theory is correct and we can get an accurate position.
The Dynamic range of the system is more than 75 dB. The smallest signal that can be detected is about 3.345x10^-4(rad/Hz).
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