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Title: Nuisance alarm reduction : using a correlation-based algorithm above differential signals in direct detected phase-OTDR systems
Authors: Adeel, M 
Shang, C 
Zhu, K 
Lu, C 
Issue Date: 2019
Publisher: Optical Society of America
Source: Optics express, 4 Mar. 2019, v. 27, no. 5, p. 7685-7698 How to cite?
Journal: Optics express 
Abstract: Significant research efforts have focused on techniques for alleviating the nuisance alarm rate (NAR) in the field of phi-OTDR pattern recognition systems. Unfortunately, ephemeral events were mostly neglected in previous research, and algorithms meant for improving classification accuracy were emphasized at the cost of acquiring a very large number of traces. This problem engendered an additional source of NAR in a specific class of events. The proposed solution uses a novel correlation based wrapper on top of differential signals that aims to filter out the effect of unnecessary phases in direct detected phi-OTDR systems. This technique avoids the use of irrelevant data in these differential signals by exploiting a better use of these unnecessary phases and provides a better intensity translation with fewer acquired traces as compared with contemporary techniques of extracting features.
EISSN: 1094-4087
DOI: 10.1364/OE.27.007685
Rights: © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
The following publication M. Adeel, C. Shang, K. Zhu, and C. Lu, "Nuisance alarm reduction: Using a correlation based algorithm above differential signals in direct detected phase-OTDR systems," Opt. Express 27, 7685-7698 (2019) is available at
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