Distributed analysis of forward stimulated Brillouin scattering for acoustic impedance sensing by extraction of a 2nd-order local spectrum

Distributed analysis of forward stimulated Brillouin scattering for acoustic impedance sensing by extraction of a 2nd-order local spectrum

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,...

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Veröffentlicht in:Chinese physics B 2021-07, Vol.30 (8), p.84205-431
Hauptverfasser: Yang, Yu-Lian, Lin, Jia-Bing, Liu, Li-Ming, Jia, Xin-Hong, Liang, Wen-Yan, Xu, Shi-Rong, Jiang, Li
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container_end_page 431
container_issue 8
container_start_page 84205
container_title Chinese physics B
container_volume 30
creator Yang, Yu-Lian
Lin, Jia-Bing
Liu, Li-Ming
Jia, Xin-Hong
Liang, Wen-Yan
Xu, Shi-Rong
Jiang, Li
description 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.
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title Distributed analysis of forward stimulated Brillouin scattering for acoustic impedance sensing by extraction of a 2nd-order local spectrum
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