Interferometric distributed sensing system with phase optical time-domain reflectometry
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We demonstrate a distributed optical fiber sensing system based on the Michelson interferometer of the phase sensitive optical time domain reflectometer (φ-OTDR) for acoustic measurement. Phase, amplitude, frequency response, and location information can be directly obtained at the same time by using the passive 3×3 coupler demodulation. We also set an experiment and successfully restore the acoustic information. Meanwhile, our system has preliminary realized acoustic-phase sensitivity around −150 dB (re rad/μPa) in the experiment.
KeywordsFiber optics sensors Rayleigh scattering optical time domain reflectometry interferometry
This work was supported by the Shandong Natural Science Foundation (No. ZR2013FL028), Science and Technology Development Project of Shandong Province (2014GGX103019), and Innovation and Achievement Transformation Projects of Shandong Province (2014ZZCX04206).
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