期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 31, 期 23, 页码 3631-3637出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2013.2286223
关键词
Distributed sensor; optical fiber sensors; phase-sensitive OTDR; vibration measurements
资金
- European Research Council [307441]
- Spanish Plan Nacional de I+D+i [TEC2012-37958-C02-01, TEC2012-37958-C02-02, FACTOTEM2]
- Comunidad de Madrid
- INTERREG SUDOE
- Portuguese Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BD/76991/2011]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/76991/2011] Funding Source: FCT
- European Research Council (ERC) [307441] Funding Source: European Research Council (ERC)
Phase-sensitive optical time domain reflectometry (phi OTDR) is a simple and effective tool allowing the distributed monitoring of vibrations along single-mode fibers. Up to now, phi 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 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.
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