Journal
OPTICAL FIBER TECHNOLOGY
Volume 52, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2019.101980
Keywords
Distributed acoustic sensor; phi-OTDR; Event detection method; Extreme learning machine
Funding
- Natural Science Foundation of China [61420106011, 61601279, 61601277]
- Shanghai Science and Technology Development Funds [17010500400, 18511103400, 16YF1403900]
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We investigate two kinds of event detection methods, support vector machine (SVM) and extreme learning machine (ELM), for distributed acoustic sensors (DAS) using phase-sensitive optical time domain reflectometer (phi-OTDR). We propose a heterodyne coherent phi-OTDR platform using an electric mixer, select spectrogram image feature (SIF) as a feature vector, and make comparison of the performance of 4 event classifiers. Theoretical and experimental analysis point out that an ELM classifier with RBF kernel is optimal in the detection of 5 sound events that has high identification accuracy, less training time, less testing time and strong noise immunity, which promises to be the first choice of event detection method in phi-OTDR systems in industrial applications.
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