Guided wave annular array sensor design for improved tomographic imaging

Jaya Prakash Koduru, Joseph Lawrence Rose

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations

Abstract

Guided wave tomography for structural health monitoring is fast emerging as a reliable tool for the detection and monitoring of hotspots in a structure, for any defects arising from corrosion, crack growth etc. To date guided wave tomography has been successfully tested on aircraft wings, pipes, pipe elbows, and weld joints. Structures practically deployed are subjected to harsh environments like exposure to rain, changes in temperature and humidity. A reliable tomography system should take into account these environmental factors to avoid false alarms. The lack of mode control with piezoceramic disk sensors makes it very sensitive to (races of water leading to false alarms. In this study we explore the design of annular array sensors to provide mode control for improved structural tomography, in particular, addressing the false alarm potential of water loading. Clearly defined actuation lines in the phase velocity dispersion curve space are calculated. A dominant in-plane displacement point is found to provide a solution to the water loading problem. The improvement in the tomographic images with the annular array sensors in the presence of water traces is clearly illustrated with a series of experiments. An annular array design philosophy for other problems in NDE/SHM is also discussed.

Original languageEnglish (US)
Pages (from-to)658-665
Number of pages8
JournalAIP Conference Proceedings
Volume1096
DOIs
StatePublished - May 12 2009
EventReview of Progress in Quantitative Nondestructive Evaluation - Chicago, IL, United States
Duration: Jul 20 2008Jul 25 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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