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Proceedings Paper

Distributed Brillouin optical fiber sensing for dynamic strain with frequency agility based on dual-modulation
Author(s): Dexin Ba; Dengwang Zhou; Benzhang Wang; Mingjing Yin; Yongkang Dong; Zhiwei Lu; Zhigang Fan
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Paper 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.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235R (23 April 2017); doi: 10.1117/12.2262209
Show Author Affiliations
Dexin Ba, Harbin Institute of Technology (China)
Dengwang Zhou, Harbin Institute of Technology (China)
Benzhang Wang, Harbin Institute of Technology (China)
Mingjing Yin, Harbin Medical Univ. (China)
Yongkang Dong, Harbin Institute of Technology (China)
Zhiwei Lu, Harbin Institute of Technology (China)
Zhigang Fan, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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