An acoustic nonlinearity measurement technique with built-in couplant effect elimination

L. Sun*, S. S. Kulkarni, B. Moran, S. Krishnaswamy, J. D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


A modified technique to measure acoustic nonlinearity in fatigued components is proposed in this paper. As opposed to the conventional technique to measure acoustic nonlinearity, the proposed technique eliminates the couplant effects between the transducers and the specimen. The proposed technique is compared with the conventional technique by performing nonlinearity measurements on a fatigued aluminum alloy specimen and calculating the coefficient of variation (COV) of the nonlinearity parameter. Preliminary results show that the COV of the nonlinearity parameter obtained using the modified technique is approximately half of that obtained using conventional technique. It is therefore felt that the proposed technique will help to reduce the variability in the nonlinearity measurements in fatigued components.

Original languageEnglish (US)
Article number42
Pages (from-to)363-368
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventHealth Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV - San Diego, CA, United States
Duration: Mar 7 2005Mar 9 2005


  • Couplant effect elimination
  • Fatigue
  • Nonlinearity measurements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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