Defect classification based on wavelet packet energy through pulsed alternating current field measurement technique

Jiuhao Ge; Chenkai Yang; Ping Wang; Yongsheng Shi

Defect classification based on wavelet packet energy through pulsed alternating current field measurement technique

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Author(s): Jiuhao Ge¹ ; Chenkai Yang¹ ; Ping Wang¹ ; Yongsheng Shi²
- Affiliations: 1: Non-destructive Detection and Monitoring Technology for High-Speed Transportation Facilities , Key Laboratory of Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics , Nanjing, Jiangsu, 210016 , People's Republic of China ;
  2: Railway Infrastructure Inspection Center, Chinese State Railway Group Co., Ltd. , Beijing 100081 , People's Republic of China
Source: Volume 56, Issue 19, 17 September 2020, p. 1016 – 1019
DOI: 10.1049/el.2020.1574 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 27/05/2020, Published 18/06/2020

In this Letter, a wavelet packet energy-based algorithm is proposed to classify surface and non-surface slits through the pulsed alternating current field measurement technique. Wavelet packet decomposition is used to obtain the coefficient of each frequency band. The slit is classified as non-surface slit or surface slit according to the normalised energy of the first band. The quantification of the remaining ligament or depth of slits is performed using the entropy of the wavelet packet energy. The experiment results show that the non-surface and surface slits can be clearly classified. The entropy of a non-surface slit is linearly proportional to the remaining ligament, and the entropy of a surface slit is inversely proportional to slit depth.

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