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• W2344772783 endingPage "9781" @default.
• W2344772783 startingPage "9781" @default.
• W2344772783 abstract "We propose and demonstrate a dynamic Brillouin optical fiber sensing based on the multi-slope assisted fast Brillouin optical time-domain analysis (F-BOTDA), which enables the measurement of a large strain with real-time data processing. The multi-slope assisted F-BOTDA is realized based on the double-slope demodulation and frequency-agile modulation, which significantly increases the measurement range compared with the single- or double- slope assisted F-BOTDA, while maintaining the advantage of fast data processing and being suitable for real-time on-line monitoring. A maximum strain variation up to 5000με is measured in a 32-m fiber with a spatial resolution of ~1m and a sampling rate of 1kHz. The frequency of the strain is 12.8Hz, which is limited by the rotation rate of the motor used to load the force on the fiber. Furthermore, the influence of the frequency difference between two adjacent probe tones on the measurement error is studied theoretically and experimentally for optimization. For a Brillouin gain spectrum with a 78-MHz width, the optimum frequency difference is ~40MHz. The measurement error of Brillouin frequency shift is less than 3MHz over the whole measurement range (241MHz)." @default.
• W2344772783 created "2016-06-24" @default.
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• W2344772783 date "2016-04-27" @default.
• W2344772783 modified "2023-10-17" @default.
• W2344772783 title "Distributed measurement of dynamic strain based on multi-slope assisted fast BOTDA" @default.
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• W2344772783 doi "https://doi.org/10.1364/oe.24.009781" @default.
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