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Optical fiber vibration sensing system using delay line method
Author(s) -
Wang Yu,
Ding Kai,
Xu Yuelin,
Song Xiaoda,
Zhang Jianguo,
Liu Xin,
Bai Qing,
Wang Dong,
Zhang Mingjiang,
Jin Baoquan
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31634
Subject(s) - narrowband , vibration , acoustics , broadband , optical fiber , line (geometry) , signal (programming language) , optics , physics , computer science , mathematics , geometry , programming language
A delay line method for a distributed optical fiber vibration sensing system is reported. The sensing system is a combination of non‐balanced Sagnac/Mach‐Zehnder structure and an adjustable optical fiber delay line. The vibration location principle is the expansion of conventional null‐frequencies theory, which needs to adjust the length of delay line, in order to determine a zero point in the amplitude variation curve of detected light intensity for one characteristic frequency appearing in the vibration signal spectrum. Moreover, the location simulation using delay line method for narrowband vibration signals is affected. Finally, the experiment verifies that the location errors of vibration events are within ±70 m. The main advantage of proposed method is that it can locate not only the broadband vibration but also the narrowband vibration.