Distributed Brillouin optical fiber sensing for dynamic strain with frequency agility based on dual-modulation

Dexin Ba; Dengwang Zhou; Benzhang Wang; Mingjing Yin; Yongkang Dong; Zhiwei Lu; Zhigang Fan

doi:10.1117/12.2262209

23 April 2017 Distributed Brillouin optical fiber sensing for dynamic strain with frequency agility based on dual-modulation

Dexin Ba, Dengwang Zhou, Benzhang Wang, Mingjing Yin, Yongkang Dong, Zhiwei Lu, Zhigang Fan

Author Affiliations +

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.

Citation Download Citation

Dexin Ba, Dengwang Zhou, Benzhang Wang, Mingjing Yin, Yongkang Dong, Zhiwei Lu, and 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); https://doi.org/10.1117/12.2262209

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