Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7124369 | Measurement | 2016 | 8 Pages |
Abstract
In order to detect the weak underwater acoustic signal, a Distributed Acoustic Sensing (DAS) scheme based on the self-interference of Rayleigh backscattering is presented. Rayleigh backscattered light which contains a phase change induced by acoustic signal along the sensing fiber which is a standard telecom single-mode fiber is split and fed into an imbalance Michelson interferometer. With the self-interference of two Rayleigh backscattered beams, the phase change is amplified theoretically compared with phase-sensitive OTDR. We designed an experiment to prove the scheme, and successfully restored the acoustic information, meanwhile, the DAS system has preliminary realized around the acoustic phase sensitivity of â151 dB (re rad/μPa) at 600 Hz, and the minimum detectable acoustic pressure of 6 Pa in the experiment.
Related Topics
Physical Sciences and Engineering
Engineering
Control and Systems Engineering
Authors
Ying Shang, Yuanhong Yang, Chen Wang, Xiaohui Liu, Chang Wang, Gangding Peng,