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