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Sensors 2013, 13(2), 1836-1845; doi:10.3390/s130201836
Article

Distributed Temperature and Strain Discrimination with Stimulated Brillouin Scattering and Rayleigh Backscatter in an Optical Fiber

* ,
,
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Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada
* Author to whom correspondence should be addressed.
Received: 3 December 2012 / Revised: 21 January 2013 / Accepted: 28 January 2013 / Published: 31 January 2013
(This article belongs to the Section Physical Sensors)
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Abstract

A distributed optical fiber sensor with the capability of simultaneously measuring temperature and strain is proposed using a large effective area non-zero dispersion shifted fiber (LEAF) with sub-meter spatial resolution. The Brillouin frequency shift is measured using Brillouin optical time-domain analysis (BOTDA) with differential pulse-width pair technique, while the spectrum shift of the Rayleigh backscatter is measured using optical frequency-domain reflectometry (OFDR). These shifts are the functions of both temperature and strain, and can be used as two independent parameters for the discrimination of temperature and strain. A 92 m measurable range with the spatial resolution of 50 cm is demonstrated experimentally, and accuracies of ±1.2 °C in temperature and ±15 με in strain could be achieved.
Keywords: optical fiber sensors; temperature and strain discrimination; stimulated Brillouin scattering; Rayleigh scattering optical fiber sensors; temperature and strain discrimination; stimulated Brillouin scattering; Rayleigh scattering
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Zhou, D.-P.; Li, W.; Chen, L.; Bao, X. Distributed Temperature and Strain Discrimination with Stimulated Brillouin Scattering and Rayleigh Backscatter in an Optical Fiber. Sensors 2013, 13, 1836-1845.

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