High-axial-resolution distributed lateral displacement measurement based on differential pulse-width pair BOTDA

Yongkang Dong; Xiaoyi Bao; Liang Chen

doi:10.1117/12.899386

19 May 2011 High-axial-resolution distributed lateral displacement measurement based on differential pulse-width pair BOTDA

Yongkang Dong, Xiaoyi Bao, Liang Chen

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 7753A8 (2011) https://doi.org/10.1117/12.899386
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

We report for the first time to the best of our knowledge a distributed lateral displacement sensor through measuring high-spatial-resolution axial strain based on differential pulse-width pair Brillouin optical time-domain analysis. With the assumption of a sine-shape displacement caused by a small surface deformation, the relationship between the axial strain and the lateral displacement of a flat plate is established, based on which a distributed lateral displacement measurement is realized. In experiment, a periodic lateral displacement of a flat plate is constructed through a ripple spring by applying side pressure on them, and the axial strain measurement with a 2-cm spatial resolution is performed by using a differential pulse pair of 8/8.2 ns. Using two types of ripple springs, measurements of lateral displacements with periods of 30 and 32.5 mm are demonstrated with a maximum displacement of 0.43 mm and a minimum measurable displacement of ~40 μm.

Citation Download Citation

Yongkang Dong, Xiaoyi Bao, and Liang Chen "High-axial-resolution distributed lateral displacement measurement based on differential pulse-width pair BOTDA", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 7753A8 (19 May 2011); https://doi.org/10.1117/12.899386

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