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Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System
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...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4883372/ https://www.ncbi.nlm.nih.gov/pubmed/27187396 http://dx.doi.org/10.3390/s16050681 |
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author | He, Haijun Shao, Li-Yang Li, Zonglei Zhang, Zhiyong Zou, Xihua Luo, Bin Pan, Wei Yan, Lianshan |
author_facet | He, Haijun Shao, Li-Yang Li, Zonglei Zhang, Zhiyong Zou, Xihua Luo, Bin Pan, Wei Yan, Lianshan |
author_sort | He, Haijun |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-4883372 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-48833722016-05-27 Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System He, Haijun Shao, Li-Yang Li, Zonglei Zhang, Zhiyong Zou, Xihua Luo, Bin Pan, Wei Yan, Lianshan Sensors (Basel) Article 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. MDPI 2016-05-12 /pmc/articles/PMC4883372/ /pubmed/27187396 http://dx.doi.org/10.3390/s16050681 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article He, Haijun Shao, Li-Yang Li, Zonglei Zhang, Zhiyong Zou, Xihua Luo, Bin Pan, Wei Yan, Lianshan Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System |
title | Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System |
title_full | Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System |
title_fullStr | Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System |
title_full_unstemmed | Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System |
title_short | Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System |
title_sort | self-mixing demodulation for coherent phase-sensitive otdr system |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4883372/ https://www.ncbi.nlm.nih.gov/pubmed/27187396 http://dx.doi.org/10.3390/s16050681 |
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