Photonic Sensors, Volume. 7, Issue 3, 193(2017)
Distributed Acoustic Sensing With Michelson Interferometer Demodulation
The distributed acoustic sensing (DAS) has been extensively studied and widely used. A distributed acoustic sensing system based on the unbalanced Michelson interferometer with phase generated carrier (PGC) demodulation was designed and tested. The system could directly obtain the phase, amplitude, frequency response, and location information of sound wave at the same time and measurement at all points along the sensing fiber simultaneously. Experiments showed that the system successfully measured the acoustic signals with a phase-pressure sensitivity about –148 dB (re rad/μPa) and frequency response ripple less than 1.5 dB. The further field experiment showed that the system could measure signals at all points along the sensing fiber simultaneously.
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Xiaohui LIU, Chen WANG, Ying SHANG, Chang WANG, Wenan ZHAO, Gangding PENG, Hongzhong WANG. Distributed Acoustic Sensing With Michelson Interferometer Demodulation[J]. Photonic Sensors, 2017, 7(3): 193
Category: Regular
Received: Jul. 7, 2016
Accepted: Nov. 9, 2016
Published Online: Dec. 4, 2017
The Author Email: WANG Chang (wang960100@163.com)