RT info:eu-repo/semantics/article
T1 Coherent noise reduction in high visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves
A1 Fidalgo Martins, Hugo
A1 Martín López, Sonia
A1 Corredera, Pedro
A1 Filograno, M. L.
A1 Frazão, O.
A1 González Herráez, Miguel
K1 Distributed sensor
K1 Optical fiber sensors
K1 Phase-sensitive OTDR
K1 Vibration measurements
K1 Ciencias tecnológicas
K1 Electrónica
K1 Technology
K1 Electronics
AB 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
PB IEEE
SN 0733-8724
YR 2013
FD 2013
LK http://hdl.handle.net/10017/26359
UL http://hdl.handle.net/10017/26359
LA eng
NO European Commission
DS MINDS@UW
RD 16-abr-2024