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• W3126811376 abstract "A novel fiber-optic distributed acoustic sensing (DAS) system with wide frequency response of 0.1 Hz ~ 30 kHz is proposed and experimentally demonstrated. The DAS, which is induced by adjacent ultra-weak fiber Bragg gratings (UWFBGs) using dual-pulse and 3 × 3 fiber coupler in direct detection, is capable of quantifying multiple dynamic strain perturbations along 1.5 km UWFBG array with a spatial resolution of 5 m. The delay of dual-pulse equals to the round-trip time of adjacent UWFBGs and will interfere in three photo-detectors. We experimentally demonstrate the effectiveness of the technique by monitoring the dynamic response of vibration events with three different frequencies. The signal-to-noise ratios (SNRs) of DAS at the 0.1 Hz and 30 kHz are 45.92 dB and 43.33 dB, respectively. The minimum detectable strain is as low as 1.21nε. The strain response has good linear characteristics with the linear coefficient of 0.9988. The comparison with the Michelson interferometer shows the dual-pulse detection is free from external environmental perturbation, which it is very helpful for engineering application." @default.
• W3126811376 created "2021-02-15" @default.
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• W3126811376 date "2021-01-01" @default.
• W3126811376 modified "2023-10-02" @default.
• W3126811376 title "Distributed acoustic sensors with wide frequency response based on UWFBG array utilizing dual-pulse detection" @default.
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• W3126811376 doi "https://doi.org/10.1016/j.yofte.2021.102452" @default.
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