Bispectral analysis of ultrasonic inter-modulation data for improved defect detection

Andrew J Hillis, S A Neild, B W Drinkwater, P D Wilcox

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)

Abstract

This paper describes the use of the ultrasonic inter-modulation technique for damage detection, which can offer potentially far greater sensitivity than linear acoustical methods. The specimen is excited by two continuous sinusoidal ultrasonic signals at different frequencies and the resultant vibration signal is captured for interrogation. A sensitive signal processing technique, known as bispectral analysis, is utilised which has the property of suppressing signal noise, permitting the detection of small nonlinear effects in the received vibration signal. This approach is demonstrated experimentally on samples containing fatigue cracking. A model is also presented which highlights the benefits of the bispectrum approach and potentially allows for characterisation of the nonlinearity.
Original languageEnglish
Pages89-96
Number of pages8
DOIs
Publication statusPublished - 2006
Event32nd Annual Review of Process in Quantitative Nondestructive Evaluation - Brunswick, Montenegro
Duration: 31 Jul 20055 Aug 2005

Conference

Conference32nd Annual Review of Process in Quantitative Nondestructive Evaluation
CountryMontenegro
CityBrunswick
Period31/07/055/08/05

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