Study of Ф-OTDR Stability for Dynamic Strain Measurement in Piezoelectric Vibration

作     者：Meiqi REN Ping LU Liang CHEN Xiaoyi BAO 

作者机构：Department of Physics University of Ottawa Ottawa ON K1S5G5 Canada 

出 版 物：《Photonic Sensors》 (光子传感器（英文版）)

年 卷 期：2016年第6卷第3期

页      面：199-208页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 0805[工学-材料科学与工程（可授工学、理学学位）] 0835[工学-软件工程] 0803[工学-光学工程] 081002[工学-信号与信息处理] 0702[理学-物理学] 

基　　金：NSERC CREATE: Sustainable Engineering in Remote Areas (SERA) program Canada Research Chairs Natural Sciences and Engineering Research Council of Canada (NSERC) 

主　　题：Optical fiber sensors phase-sensitive optical time domain reflectometry (OTDR) vibration 

摘      要：In a phase-sensitive optical-time domain reflectometry （Ф-OTDR） system, the challenge for dynamic strain measurement lies in large intensity fluctuations from trace to trace. The intensity fluctuation caused by stochastic characteristics of Rayleigh backscattering sets detection limit for the minimum strength of vibration measurement and causes the large measurement uncertainty. Thus, a trace-to-trace correlation coefficient is introduced to quantify intensity fluctuation of Ф-OTDR traces and stability of the sensor system theoretically and experimentally. A novel approach of measuring dynamic strain induced by various driving voltages of lead zirconate titanate （PZT） in Ф-OTDR is also demonstrated. Piezoelectric vibration signals are evaluated through analyzing peak values of fast Fourier transform spectra at the fundamental frequency and high-order harmonics based on Bessel functions. High trace-to-trace correlation coefficients varying from 0.824 to 0.967 among 100 measurements are obtained in experimental results, showing the good stability of our sensor system, as well as small uncertainty of measured peak values.