Nuisance alarm reduction: Using a correlation based algorithm above differential signals in direct detected phase-OTDR systems.
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DOI: 10.1364/oe.27.007685
Abstract: Significant research efforts have focused on techniques for alleviating the nuisance alarm rate (NAR) in the field of ϕ-OTDR pattern recognition systems. Unfortunately, ephemeral events were mostly neglected in previous research and algorithms meant for… read more here.
Keywords: differential signals; otdr systems; direct detected; nuisance alarm ... See more keywords
Laser source frequency drift compensation in Φ-OTDR systems using multiple probe frequencies.
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DOI: 10.1364/oe.460302
Abstract: Fully distributed fiber sensors, such as phase sensitive optical time domain reflectometry (Φ-OTDR) systems, have drawn significant attention from researchers, especially for use in geophysical applications. Distributed sensing, cost efficiency, wide dynamic range, good spatial… read more here.
Keywords: otdr systems; low frequency; frequency; laser source ... See more keywords