摘要
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.
作者
杨玉莲
林佳兵
刘黎明
贾新鸿
梁文燕
许世蓉
姜利
Yu-Lian Yang;Jia-Bing Lin;Li-Ming Liu;Xin-Hong Jia;Wen-Yan Liang;Shi-Rong Xu;Li Jiang(College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu 610101,China)
基金
Project supported by the Sichuan Science and Technology Program(Grant No.2019YJ0530)
Scientific Research Fund of Sichuan Provincial Education Department,China(Grant No.18ZA0401)
the National Natural Science Foundation of China(Grant No.61205079).