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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 (CC BY 3.0).
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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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