2019/11/24 by Jingdong Zhang, Haoting Wu, Zhang, Jingdong +11
Engineering · #Advanced Fiber Optic Sensors #Applied Physics (physics.app-ph) #FOS: Electrical engineering #FOS: Physical sciences #Geophysics and Sensor Technology #Optical Systems and Laser Technology #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.1911.10468
openalex publication_date 2019/11/24 · openalex created_date 2019/12/05 · openalex updated_date 2026/07/28
We propose and experimentally demonstrate a technique to extend the dynamic sensing range of phase sensitive optical time domain reflectometry system based on the frequency interrogation. Benefitting from the range Doppler coupling feature, the frequency modulation pulse is capable of measuring the frequency shift induced by the dynamic strain, thus the large dynamic strain can be recovered. The performance of the proposed method is experimentally evaluated by comparing it with phase unwrapping. The strain sensing rang can at least be increased by factor of hundreds, and fast dynamic strain with peak to peak 130 microstrain vibration frequency of 20 kHz is measured.