摘要
The detection of multiple acoustic disturbances by optical fiber is a hot research topic in the field of optical fiber sensing.This paper considers adopting an optical distributed acoustic sensing(DAS)system to detect multiple acoustic disturbances,proposes a new approach to processing the DAS signal based on time-space average in frequency domain,and overcomes the randomness of DAS time domain signal.Finally,it obtains a functional model of single-frequency(50-1000 Hz)sound pressure level and DAS signal intensity,and also the cut-off frequency of acoustic disturbance is detected by DAS system.
基金
the Graduate Program Foundation of Shanghai Polytechnic University(No.EGD18YJ0045)。
