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Proceedings Paper

A novel positioning method for dual Mach-Zehnder interferometric vibration sensor in submarine cable security application
Author(s): Shangran Xie; Min Zhang; Yanhe Li; Yanbiao Liao
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Paper Abstract

Dual Mach-Zehnder interferometric vibration sensor is an appropriate solution for submarine cable security application. While in this application the detected vibration signal is always narrow-bandwidth and short-duration subject to environmental constraints, which makes correlation based vibration positioning algorithm a poor robustness to noise. A preprocessing method focusing on expanding signal 3dB bandwidth before correlation is proposed in purpose of reducing ultimate positioning mean square error. A high pass filter is imposed to enhance the weight of high frequency components by attenuating low frequency main lobe. Field test results indicate a significant positioning error reduction when using this novel method as long as the cutoff frequency of high pass filter is selected in a valid region where positive effect of bandwidth extension is larger than effect of SNR reduction, and MSE reduction value in valid region agrees well with theoretical prediction.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77530L (17 May 2011); doi: 10.1117/12.885172
Show Author Affiliations
Shangran Xie, Tsinghua Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Yanhe Li, Tsinghua Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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