Coherent noise reduction in high visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves

dc.contributor.author Martins,HF en
dc.contributor.author Martin Lopez,S en
dc.contributor.author Corredera,P en
dc.contributor.author Filograno,ML en
dc.contributor.author Orlando Frazão en
dc.contributor.author Gonzalez Herraez,M en
dc.date.accessioned 2018-01-23T13:30:03Z
dc.date.available 2018-01-23T13:30:03Z
dc.date.issued 2013 en
dc.description.abstract Phase-sensitive optical time domain reflectometry (\phi \hbox{OTDR}) is a simple and effective tool allowing the distributed monitoring of vibrations along single-mode fibers. Up to now, \phi {\rm OTDRs} have been used mostly for the measurement of sub-kHz vibrations, normally in the context of intrusion sensing. In this paper, the authors present an experimental and theoretical description of a high-visibility \phi {\rm OTDR} and its performance when used for ultrasonic vibration measurements. The use of a semiconductor optical amplifier in the setup allows to suppress coherent noise and also to improve the spectral response of the pump pulses. These two advantages greatly decrease the detected intra-band noise thus allowing frequency measurements in the limits set by the time of flight of the light pulses while maintaining the simplicity of the scheme, as no post-processing, extremely high coherence lasers or coherent detection methods are required. 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 fully distributed measurement of ultrasonic waves was achieved. The statistical behavior of the system was also described theoretically and characterized experimentally. © 2013 IEEE. en
dc.identifier.uri http://repositorio.inesctec.pt/handle/123456789/7283
dc.identifier.uri http://dx.doi.org/10.1109/jlt.2013.2286223 en
dc.language eng en
dc.relation 4061 en
dc.rights info:eu-repo/semantics/openAccess en
dc.title Coherent noise reduction in high visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves en
dc.type article en
dc.type Publication en
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