Journal
OPTICS AND LASERS IN ENGINEERING
Volume 77, Issue -, Pages 219-224Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2015.08.010
Keywords
Distrusted fiber sensor; Mach-Zehnder interferometer; Phase-sensitive OTDR
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Funding
- National Natural Science Foundation of China [61304244]
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A distributed fiber sensing system merging Mach-Zehnder interferometer and phase-sensitive optical time domain reflectometer (Phi-OTDR) is demonstrated for vibration measurement, which requires wide frequency response and accurate location. Two narrow line-width lasers with delicately different wavelengths are used to constitute the interferometer and reflectometer respectively. A narrow band Fiber Bragg Grating is responsible for separating the two wavelengths. In addition, heterodyne detection is applied to maintain the signal to noise rate of the locating signal. Experiment results show that the novel system has a wide frequency from 1 Hz to 50 MHz, limited by the sample frequency of data acquisition card, and a spatial resolution of 20 m, according to 200 ns pulse width, along 2.5 km fiber link. (c) 2015 Elsevier Ltd. All rights reserved.
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