23 April 2017 Distributed Brillouin optical fiber sensing for dynamic strain with frequency agility based on dual-modulation
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103235R (2017) https://doi.org/10.1117/12.2262209
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
A dynamic distributed Brillouin optical fiber sensing based on dual-modulation is proposed, in which the scanning of the Brillouin gain spectrum (BGS) is implemented by the combination of a single-frequency modulation and a frequency-agility modulation. The frequency of the single-frequency modulation is a little less than the Brillouin frequency shift of the fiber (∼10.8 GHz for silica fiber), while the tuning range of the frequency-agility modulation is required to cover only several-hundred MHz for the scanning of BGS, which can significantly reduce the bandwidth requirement for the arbitrary waveform generator and ultimately reduce the cost of dynamic Brillouin sensors. With a 30-m fiber, a 11.8-Hz strain is measured. The spatial resolution and the sampling rate are 1 m and 200 Hz, respectively.
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Dexin Ba, Dexin Ba, Dengwang Zhou, Dengwang Zhou, Benzhang Wang, Benzhang Wang, Mingjing Yin, Mingjing Yin, Yongkang Dong, Yongkang Dong, Zhiwei Lu, Zhiwei Lu, Zhigang Fan, Zhigang Fan, } "Distributed Brillouin optical fiber sensing for dynamic strain with frequency agility based on dual-modulation", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235R (23 April 2017); doi: 10.1117/12.2262209; https://doi.org/10.1117/12.2262209
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