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Damage Presence/Growth Monitoring Sensors


  1. Hua Gu1,
  2. Ming L. Wang2

Published Online: 15 SEP 2009

DOI: 10.1002/9780470061626.shm077

Encyclopedia of Structural Health Monitoring

Encyclopedia of Structural Health Monitoring

How to Cite

Gu, H. and Wang, M. L. 2009. Damage Presence/Growth Monitoring Sensors. Encyclopedia of Structural Health Monitoring. .

Author Information

  1. 1

    Caterpillar Inc., Advanced Structures Group, Caterpillar Production System Division, Peoria, IL, USA

  2. 2

    University of Illinois, Department of Civil and Materials Engineering, Chicago, IL, USA

Publication History

  1. Published Online: 15 SEP 2009


An interdigitated PVDF transducer (PVDF IDT) has been built in this study. This sensor generates and receives Lamb waves for damage detection. Its main features are low unit cost, easy installation, small size, superb flexibility, and the capability for wireless operation and remote interrogation. The PVDF IDT developed in this study has been applied on laminated plates composed of anisotropic carbon fiber reinforced polymer (CFRP) materials with a series of embedded defects. Results have shown that these PVDF IDTs are able to qualitatively identify the existence of defects by generating size-sensitive outcomes. The interpretation of the complex wave signals has been conducted through the employment of advanced signal-processing methods. Time-frequency representations (TFRs) such as the continuous wavelet transform (CWT) has been employed for data analysis.


  • damage detection;
  • structural health monitoring;
  • PVDF IDTs;
  • Lamb waves;
  • time-frequency representations;
  • continuous wavelet transform