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12 March 2020 Performance enhancement for phase-sensitive OTDR based on multi-spatial resolution analysis
Yusheng Chen, Yuanyuan Shan, Lu Cao, Wei Yang, Feng Wang, Yixin Zhang, Xuping Zhang
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Proceedings Volume 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 1143603 (2020) https://doi.org/10.1117/12.2539818
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China
Abstract
Phase-sensitive optical time-domain reflectometry (Ф-OTDR) has been widely used to interrogate multi-point vibration events in the health monitoring and damage detection of civil infrastructures, mechanical processes and aerospace transportation. Due to the different lengths of the events, the spatial resolution (SR) requirements would also be different. This paper presents and demonstrates two kinds of Φ-OTDR sensing systems with multi-spatial resolution (MSR) analysis characteristics. Frequency division multiplexing (FDM) and multi-scale matching filtering schemes were introduced to provide MSR ability for the phase-discrimination and amplitude-discrimination Φ-OTDR systems respectively. The proposed methods could restore vibration events of different scales with optimum signal-to-noise ratio (SNR) in merely a single measurement while maintaining the detectable frequency range, which offered promising solutions for the performance optimization of Φ-OTDR sensing systems.
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Yusheng Chen, Yuanyuan Shan, Lu Cao, Wei Yang, Feng Wang, Yixin Zhang, and Xuping Zhang "Performance enhancement for phase-sensitive OTDR based on multi-spatial resolution analysis", Proc. SPIE 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 1143603 (12 March 2020); https://doi.org/10.1117/12.2539818
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KEYWORDS
Signal to noise ratio
Electronic filtering
Scattering
Optical filters
Light scattering
Sensing systems
Signal processing
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