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      Recent Progress in Distributed Fiber Optic Sensors

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          Abstract

          Rayleigh, Brillouin and Raman scatterings in fibers result from the interaction of photons with local material characteristic features like density, temperature and strain. For example an acoustic/mechanical wave generates a dynamic density variation; such a variation may be affected by local temperature, strain, vibration and birefringence. By detecting changes in the amplitude, frequency and phase of light scattered along a fiber, one can realize a distributed fiber sensor for measuring localized temperature, strain, vibration and birefringence over lengths ranging from meters to one hundred kilometers. Such a measurement can be made in the time domain or frequency domain to resolve location information. With coherent detection of the scattered light one can observe changes in birefringence and beat length for fibers and devices. The progress on state of the art technology for sensing performance, in terms of spatial resolution and limitations on sensing length is reviewed. These distributed sensors can be used for disaster prevention in the civil structural monitoring of pipelines, bridges, dams and railroads. A sensor with centimeter spatial resolution and high precision measurement of temperature, strain, vibration and birefringence can find applications in aerospace smart structures, material processing, and the characterization of optical materials and devices.

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          Most cited references 182

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          Observation of modulational instability in optical fibers.

           K. Tai,  A Hasegawa,  A. Tomita (1986)
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            Classical Electrodynamics

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              Distributed optical fibre Raman temperature sensor using a semiconductor light source and detector

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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                Sensors (Basel, Switzerland)
                Molecular Diversity Preservation International (MDPI)
                1424-8220
                2012
                26 June 2012
                : 12
                : 7
                : 8601-8639
                Affiliations
                Physics Department, University of Ottawa, Ottawa, ON K1N6N5, Canada; E-Mail: lchen@ 123456uottawa.ca
                Author notes
                [* ]Author to whom correspondence should be addressed; E-Mail: xbao@ 123456uottawa.ca ; Tel.: +1-613-562-5800 (ext. 6911).
                Article
                sensors-12-08601
                10.3390/s120708601
                3444066
                23012508
                © 2012 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 license ( http://creativecommons.org/licenses/by/3.0/).

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