High-spatial-resolution fast Brillouin optical fiber sensor for distributed dynamic measurement based on differential double-pulse

Yongkang Dong; Taofei Jiang; Dengwang Zhou; Dexin Ba; Hongying Zhang; Zhiwei Lu; Liang Chen; Xiaoyi Bao

doi:10.1117/12.2031472

15 October 2013 High-spatial-resolution fast Brillouin optical fiber sensor for distributed dynamic measurement based on differential double-pulse

Yongkang Dong, Taofei Jiang, Dengwang Zhou, Dexin Ba, Hongying Zhang, Zhiwei Lu, Liang Chen, Xiaoyi Bao

Author Affiliations +

Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 892415 (2013) https://doi.org/10.1117/12.2031472
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

Abstract

We demonstrate a high-spatial-resolution fast Brillouin optical time-domain analysis scheme based on frequency agility and differential double-pulse for distributed dynamic measurement. The frequency-agility probe wave is obtained from the second-order sideband of the modulated light by using frequency-agility microwave signal from a wideband arbitrary waveform generator. The differential double-pulse technique is proposed to improve the spatial resolution while keeping the capability of dynamic measurement. In experiment, a spatial resolution of 20 cm is achieved by using a 52/50 ns differential double-pulse, and the distributed vibration measurement is demonstrated over a 50-m Panda fiber with a maximum vibration frequency of up to 50 Hz. With only five averages, the standard deviation of the strain accuracy is of 14με;.

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Yongkang Dong, Taofei Jiang, Dengwang Zhou, Dexin Ba, Hongying Zhang, Zhiwei Lu, Liang Chen, and Xiaoyi Bao "High-spatial-resolution fast Brillouin optical fiber sensor for distributed dynamic measurement based on differential double-pulse", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 892415 (15 October 2013); https://doi.org/10.1117/12.2031472

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KEYWORDS

Spatial resolution

Microwave radiation

Fiber optics sensors

Polarization

Fiber Bragg gratings

Modulation

Signal to noise ratio

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