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.
KeywordsDistributed acoustic sensing phase generated carrier interferometer frequency response
This work was supported by two Science and Technology Development Projects (2014GGX103019 and 2015GSF120001) of Shandong Province, and Independent Innovation Major Project (2014ZZCX04206) of Shandong Province.
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