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Proceedings Paper

High visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves
Author(s): Hugo F. Martins; Sonia Martin-Lopez; Pedro Corredera; Massimo L. Filograno; Orlando Frazão; Miguel González-Herráez
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Paper 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.

Paper Details

Date Published: 20 May 2013
PDF: 4 pages
Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87943F (20 May 2013); doi: 10.1117/12.2026081
Show Author Affiliations
Hugo F. Martins, INESC Porto (Portugal)
Univ. do Porto (Portugal)
Sonia Martin-Lopez, Univ. de Alcalá (Spain)
Pedro Corredera, Consejo Superior de Investigaciones Científicas (Spain)
Massimo L. Filograno, Consejo Superior de Investigaciones Científicas (Spain)
Orlando Frazão, INESC Porto (Portugal)
Miguel González-Herráez, Univ. de Alcalá (Spain)


Published in SPIE Proceedings Vol. 8794:
Fifth European Workshop on Optical Fibre Sensors
Leszek R. Jaroszewicz, Editor(s)

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