Self-focusing of rayleigh waves and lamb waves with a linear phased array

W. A.K. Deutsch, A. Cheng, J. D. Achenbach

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


A simple idea for self-focusing of a linear array has been extended to Rayleigh and Lamb waves. The self-focusing procedure first measures the backscattered signals for a first transmission by a single element of the array. A cross-correlation technique is used to determine the time-of-flight differences of the backscattered signals received by the elements of the array. These time delays are used to adjust the times of excitation of the elements for transmission focusing on the defect. Using the differences in arrival time once more, the backscattered signals after transmission focusing are aligned for reception focusing. Experimental results demonstrate the ability to self-focus on single defects. For multiple defects, the technique has been extended to focus on the defect that produces the largest backscattered signal.

Original languageEnglish (US)
Pages (from-to)81-95
Number of pages15
JournalResearch in Nondestructive Evaluation
Issue number2
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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