Interferometric distributed sensing system with phase optical time-domain reflectometry

Abstract

Abstract 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.

Keywords

• Fiber optics sensors
• Rayleigh scattering
• optical time domain reflectometry
• interferometry