Mr. Zichao Zhang Profile

Zichao Zhang

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Proceedings Article | 18 June 2021 Paper

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

Proceedings Volume 11850, 118500O (2021) https://doi.org/10.1117/12.2599504

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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.

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