Abstract Distributed fiber sensors based on forward stimulated Brillouin scattering (F-SBS) have attracted special attention because of their capability to detect the acoustic impedance of liquid material outside fiber. However, the reported results were based on the extraction of a 1st-order local spectrum, causing the sensing distance to be restricted by pump depletion. Here, a novel post-processing technique was proposed for distributed acoustic impedance sensing by extracting the 2nd-order local spectrum, which is beneficial for improving the sensing signal-to-noise ratio (SNR) significantly, since its pulse energy penetrates into the fiber more deeply. As a proof-of-concept, distributed acoustic impedance sensing along ～1630 m fiber under moderate spatial resolution of ～20 m was demonstrated.
(Brillouin and Rayleigh scattering; other light scattering)
Fund: Project supported by the Sichuan Science and Technology Program (Grant No. 2019YJ0530), Scientific Research Fund of Sichuan Provincial Education Department, China (Grant No. 18ZA0401), and the National Natural Science Foundation of China (Grant No. 61205079).
Yu-Lian Yang(杨玉莲), Jia-Bing Lin(林佳兵), Li-Ming Liu(刘黎明), Xin-Hong Jia(贾新鸿), Wen-Yan Liang(梁文燕), Shi-Rong Xu(许世蓉), and Li Jiang(姜利) Distributed analysis of forward stimulated Brillouin scattering for acoustic impedance sensing by extraction of a 2nd-order local spectrum 2021 Chin. Phys. B 30 084205
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