Sensors, Vol. 21, Pages 5094: Aircraft Detection Using Phase-Sensitive Optical-Fiber OTDR

We present a detection system using Φ-OTDR technology and analyze the character of the acoustic signal of aircraft. Instead of runway monitoring in the airport or noise detection in the air, this study focuses on the detection of seismic vibration signal excited by the sound of aircraft. The Chebyshev filter is adopted to eliminate the impact of background noise and random noise from the original vibration signal; the short-time Fourier transform is used for time-frequency analysis. The experimental results showed that the seismic vibration signal excited by the aircraft sound is mainly low-frequency, which is under 5 Hz. Time delay of aircraft vibration signal in different locations of the optic fiber is recorded by the sensing system. The Doppler effect is also revealed by the time-domain analysis: the frequency increases when the aircraft is approaching and decreases when the aircraft moves away.

Source: Sensors - July 28, 2021 Category: Biotechnology Authors: Yunpeng Cai Jihui Ma Wenfa Yan Wenyi Zhang Yuhang An Tags: Communication Source Type: research