Time delay comb transducers for aircraft inspection

F. Yan, J. L. Rose

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


An ultrasonic guided wave technique based on time delay comb transducers is introduced for aircraft inspection. It is demonstrated that for isotropic plate structures the time delay comb transducers with appropriate excitation are capable of performing discontinuity detections without knowing the precise isotropic material properties of the objects being inspected. Fibre-reinforced composite plates are also considered. The wave skew effects are investigated using both the slowness curve and the Poynting vector. A composite inspection technique that takes advantage of the skew effects is proposed. Using time delay comb transducers to excite the guided wave modes with different skew angles, the proposed technique is capable of scanning the composite plate in different directions without moving or rotating the transducers. By contrast with the applications in the isotropic cases, knowledge of the material properties and other necessary information that is needed to produce dispersion curves is generally required. Experimental results are provided as a validation of the proposed techniques.

Original languageEnglish (US)
Pages (from-to)417-427
Number of pages11
JournalAeronautical Journal
Issue number1144
StatePublished - Jun 2009

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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