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Sensors 2016, 16(5), 681;

Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System

Center for Information Photonics & Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 29 March 2016 / Revised: 3 May 2016 / Accepted: 9 May 2016 / Published: 12 May 2016
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [2123 KB, uploaded 12 May 2016]   |  


Phase-sensitive optical time domain reflectometry (Ф-OTDR) attracts much attention due to its capability of telling the type and position of an intrusion simultaneously. In recent decades, coherent Ф-OTDR has been demonstrated to realize long-distance detection. For coherent Ф-OTDR, there are three typical demodulation schemes in the reported studies. However, they still cannot realize real-time monitoring to satisfy practical demands. A simple and effective demodulation method based on self-mixing has been put forward to demodulate the beat signal in coherent Ф-OTDR. It not only saves a local electrical oscillator and frequency locked loop, but also demodulates the beat signal without residual frequency. Several vibrations with different frequency were separately applied at the same location of a 42.5 km fiber. The spatial resolution of 10 m and frequency response range from 8 Hz to 980 Hz have been achieved. The precise location with signal-to-noise ratio of 21.4 dB and broadband measurement demonstrate the self-mixing scheme can demodulate the coherent Ф-OTDR signal effectively. View Full-Text
Keywords: fiber optics sensors; remote sensing and sensors; scattering measurement; optical time domain reflectometry fiber optics sensors; remote sensing and sensors; scattering measurement; optical time domain reflectometry

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He, H.; Shao, L.-Y.; Li, Z.; Zhang, Z.; Zou, X.; Luo, B.; Pan, W.; Yan, L. Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System. Sensors 2016, 16, 681.

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