Abstract

This paper extends the capabilities of chirped-pulse phase-sensitive optical time-domain reflectometry to the measurement of large dynamic strains over hundreds of meters of standard single-mode fiber. Benefitting from single-shot strain measurements, this technique has already demonstrated dynamic strains of the order of submicrostrains with a sensitivity of picostrains-per-root-Hertz. Yet, for large dynamic strains, it relies on the accumulation of incremental measurements, where each trace is cross correlated with its predecessor to determine the relative change of strain. However, practical time records of measured high slew-rate applied perturbations contain disturbing outliers. We then detail and analyze a post-processing strategy to mitigate this limitation. Through this strategy, we are able to achieve for the first time (to our knowledge) high signal-to-noise Rayleigh-backscattering-based distributed measurements of large and fast dynamic strains of a longitudinally vibrating 4 m section at the end of 210 m of a single-mode fiber: from peak to peak 150–1190 με at vibration frequency of 400 Hz and 50 Hz, respectively.

Large dynamic strain measurement via slope-assisted Brillouin optical time domain reflectometry using a frequency equalizer

Ge Liu, Dongjiang Zou, Ruoxue Wei, Tian Li, Guiguang Chen, and Junhui Hu
Opt. Lett. 48(6) 1407-1410 (2023)

Continuous chirped-wave phase-sensitive optical time domain reflectometry

Jialin Jiang, Zinan Wang, Zitan Wang, Zijie Qiu, Chunye Liu, and Yunjiang Rao
Opt. Lett. 46(3) 685-688 (2021)

Fast Brillouin optical time-domain reflectometry using the optical chirp chain reference wave

Dexin Ba, Benzhang Wang, Tianfu Li, Yijia Li, Dengwang Zhou, and Yongkang Dong
Opt. Lett. 45(19) 5460-5463 (2020)

Temperature-strain discrimination in distributed optical fiber sensing using phase-sensitive optical time-domain reflectometry

Xin Lu, Marcelo A. Soto, and Luc Thévenaz
Opt. Express 25(14) 16059-16071 (2017)

High-sensitivity optical time-domain reflectometry based on Brillouin dynamic gratings in polarization maintaining fibers

Kwang Yong Song
Opt. Express 20(25) 27377-27383 (2012)