Fast Brillouin optical time-domain reflectometry based on frequency-agile technology for dynamic strain measurements

Benzhang Wang; Yupeng Zhang; Zichao Zhang; Xianlei Ye; Dongliang Quan

doi:10.1117/12.2599504

18 June 2021 Fast Brillouin optical time-domain reflectometry based on frequency-agile technology for dynamic strain measurements

Benzhang Wang, Yupeng Zhang, Zichao Zhang, Xianlei Ye, Dongliang Quan

Author Affiliations +

Proceedings Volume 11850, First Optics Frontier Conference; 118500O (2021) https://doi.org/10.1117/12.2599504
Event: First Optics Frontier Conference, 2021, Hangzhou, China

Abstract

Two types of fast Brillouin optical time-domain reflectometry (BOTDR) for dynamic strain measurements have been proposed and experimentally demonstrated based on the frequency-agile technology. Using the frequency-agile modulated reference wave, the spontaneous Brillouin gain spectrum (BGS) is fast scanned in the frequency domain. Then, the spontaneous BGS can be reconstructed in the time domain by employing the band-pass filter and envelope detection. The frequency-agile technology enables two fast frequency-modulation methods, optical frequency sweeping and optical chirp chain modulation. Based on these two methods, the proposed fast BOTDR allows for a distributed, one-end-access and dynamic strain measurements. Besides, the sensing performance is investigated with different experiment parameters. The dynamic strain with dozens of Hertz vibrating frequency is successfully measured for both fast BOTDR schemes, which shows the proposed fast BOTDR a bright prospect.

Citation Download Citation

Benzhang Wang, Yupeng Zhang, Zichao Zhang, Xianlei Ye, and Dongliang Quan "Fast Brillouin optical time-domain reflectometry based on frequency-agile technology for dynamic strain measurements", Proc. SPIE 11850, First Optics Frontier Conference, 118500O (18 June 2021); https://doi.org/10.1117/12.2599504

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