20 May 2013 High visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves
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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87943F (2013) https://doi.org/10.1117/12.2026081
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland
Abstract
In structural health monitoring, the propagation of ultrasonic waves along a structure can reveal interesting data relevant to the integrity of the whole structure. The availability of a system for distributed sensing of ultrasonic waves could, in some cases (e.g. pipelines) provide extremely valuable information to civil engineers. Phase-sensitive optical time domain reflectometry (ΦOTDR) is a simple and effective tool allowing the distributed monitoring of vibrations along single-mode fibers. Up to now, ΦOTDRs have been used mostly for the measurement of sub-kHz vibrations. In this work, the authors present an experimental characterization of a high-visibility ΦOTDR and its performance when used for ultrasonic vibration measurements. The sensor was able to measure vibrations of up to 39.5 kHz with a resolution of 5 m over a range which could go up to 1.25 km. This is the first time to our knowledge that a ΦOTDR is demonstrated for distributed measurement of ultrasonic waves.
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Hugo F. Martins, Hugo F. Martins, Sonia Martin-Lopez, Sonia Martin-Lopez, Pedro Corredera, Pedro Corredera, Massimo L. Filograno, Massimo L. Filograno, Orlando Frazão, Orlando Frazão, Miguel González-Herráez, Miguel González-Herráez, } "High visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87943F (20 May 2013); doi: 10.1117/12.2026081; https://doi.org/10.1117/12.2026081
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