Adaptive and robust filtering techniques for ultrasonic flaw detection

X. Li, R. Murthy, K. Donohue, N. M. Bilgutay

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


An overview is presented of a number of adaptive flaw enhancement techniques based on the statistical properties of the order-statistic operation (e.g., median or minimization) or the group delay of the received ultrasonic signal. Nonlinear statistical-filtering techniques using frequency-diverse observations that utilize these adaptive properties to improve flaw detection are examined. These concepts are also applied to develop an adaptive-correlation receiver. Furthermore, it is shown that the geometric mean of the decorrelated observations yields outputs that are relatively insensitive to critical-processing parameters. Experimental results using stainless steel samples are presented to demonstrate the robust and adaptive nature of the filters.

Original languageEnglish
Pages (from-to)1145-1149
Number of pages5
JournalUltrasonics Symposium Proceedings
StatePublished - 1989
EventIEEE 1989 Ultrasonics Symposium - Montreal, Que, Can
Duration: Oct 3 1989Oct 6 1989

ASJC Scopus subject areas

  • General Engineering


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