Imaging time series for the classification of EMI discharge sources

Imene Mitiche*, Gordon Morison, Alan Nesbitt, Michael Hughes-Narborough, Brian G. Stewart, Philip Boreham

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

In this work, we aim to classify a wider range of Electromagnetic Interference (EMI) discharge sources collected from new power plant sites across multiple assets. This engenders a more complex and challenging classification task. The study involves an investigation and development of new and improved feature extraction and data dimension reduction algorithms based on image processing techniques. The approach is to exploit the Gramian Angular Field technique to map the measured EMI time signals to an image, from which the significant information is extracted while removing redundancy. The image of each discharge type contains a unique fingerprint. Two feature reduction methods called the Local Binary Pattern (LBP) and the Local Phase Quantisation (LPQ) are then used within the mapped images. This provides feature vectors that can be implemented into a Random Forest (RF) classifier. The performance of a previous and the two new proposed methods, on the new database set, is compared in terms of classification accuracy, precision, recall, and F-measure. Results show that the new methods have a higher performance than the previous one, where LBP features achieve the best outcome.
Original languageEnglish
Article number3098
Number of pages17
JournalSensors
Volume18
Issue number9
DOIs
Publication statusPublished - 14 Sep 2018

Keywords

  • EMI method; EMI discharge sources; classification; Gramian Angular Field; Local Binary Pattern; Local Phase Quantisation

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