High-Spatial-Resolution Fast BOTDA for Dynamic Strain Measurement Based on Differential Double-Pulse and Second-Order Sideband of Modulation

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

doi:10.1109/JPHOT.2013.2267532

IEEE Photonics Journal (Jan 2013)

High-Spatial-Resolution Fast BOTDA for Dynamic Strain Measurement Based on Differential Double-Pulse and Second-Order Sideband of Modulation

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

Affiliations

Yongkang Dong: <formula formulatype="inline"><tex Notation="TeX">$^{1}$</tex></formula> Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China
Dexin Ba: Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China
Taofei Jiang: Institute of Opto-Electronics, Harbin Institute of Technology, Harbin , China
Dengwang Zhou: Institute of Opto-Electronics, Harbin Institute of Technology, Harbin , China
Hongying Zhang: <formula formulatype="inline"><tex Notation="TeX">$^{2}$</tex></formula> Department of Optics Information Science and Technology, Harbin University of Science and Technology, Harbin, China
Chengyu Zhu: Institute of Opto-Electronics, Harbin Institute of Technology, Harbin , China
Zhiwei Lu: Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China
Hui Li: <formula formulatype="inline"><tex Notation="TeX">$^{3}$</tex></formula>School of Civil Engineering, Harbin Institute of Technology, Harbin, China
Liang Chen: <formula formulatype="inline"><tex Notation="TeX">$^{4}$</tex></formula> Fiber Optics Lab, Department of Physics, University of Ottawa, Ottawa, Canada
Xiaoyi Bao: Fiber Optics Lab, Department of Physics, University of Ottawa, Ottawa , Canada

DOI: https://doi.org/10.1109/JPHOT.2013.2267532
Journal volume & issue: Vol. 5, no. 3
pp. 2600407 – 2600407

Abstract

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We demonstrate a high-spatial-resolution fast Brillouin optical time-domain analysis (BOTDA) for distributed dynamic strain measurement based on differential double-pulse and second-order sideband of modulation. The frequency-agility probe wave is obtained from the second-order sideband of the modulated light by using the microwave signal from a wideband arbitrary waveform generator (AWG), which reduces the bandwidth requirement of the AWG by half to ~ 5.5 GHz. The differential double-pulse scheme 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 polarization-maintaining fiber observing the vibration frequency of up to 50 Hz. With only five averages, the standard deviation of the strain accuracy is measured to be 14 με.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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