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Sensors 2014, 14(3), 4731-4754; doi:10.3390/s140304731
Article

Synthetic Spectrum Approach for Brillouin Optical Time-Domain Reflectometry

1,* , 2
,
2
 and
2
1 Office for University-Industry Collaboration, Osaka University, Yamadaoka 2-8, Osaka 565-0871, Japan 2 Neubrex Co., Ltd., Sakaemachi-dori 1-1-24, Kobe 650-0023, Japan
* Author to whom correspondence should be addressed.
Received: 31 December 2013 / Revised: 13 February 2014 / Accepted: 26 February 2014 / Published: 7 March 2014
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Abstract

We propose a novel method to improve the spatial resolution of Brillouin optical time-domain reflectometry (BOTDR), referred to as synthetic BOTDR (S-BOTDR), and experimentally verify the resolution improvements. Due to the uncertainty relation between position and frequency, the spatial resolution of a conventional BOTDR system has been limited to about one meter. In S-BOTDR, a synthetic spectrum is obtained by combining four Brillouin spectrums measured with different composite pump lights and different composite low-pass filters. We mathematically show that the resolution limit, in principle, for conventional BOTDR can be surpassed by S-BOTDR and experimentally prove that S-BOTDR attained a 10-cm spatial resolution. To the best of our knowledge, this has never been achieved or reported.
Keywords: Brillouin scattering; distributed sensor; optical fiber sensor; optical time-domain reflectometry (OTDR); strain measurement; synthetic spectrum; temperature measurement Brillouin scattering; distributed sensor; optical fiber sensor; optical time-domain reflectometry (OTDR); strain measurement; synthetic spectrum; temperature measurement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nishiguchi, K.; Li, C.-H.; Guzik, A.; Kishida, K. Synthetic Spectrum Approach for Brillouin Optical Time-Domain Reflectometry. Sensors 2014, 14, 4731-4754.

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