Ultrasonic backscatter in two-phase media and its dependency on the correlation function

Dalie Liu, Joseph A. Turner

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


The microstructure of sintered metals and ceramics may be modeled as two phases consisting of the particles and a surrounding matrix during certain processing stages. Diffuse ultrasonic backscatter has been widely used to extract the microstructural parameters and also to detect flaws in such materials. In this research, a singly-scattered response model is used to predict the grain noise for the two-phase model. The expression of backscatter coefficient is derived and found to be dependent on the spatial correlations of the material properties. The geometric two-point correlation function plays an important role in this model and can be determined from numerical correlation statistics. Good agreement is found between the results determined from the model and the experimental results.

Original languageEnglish (US)
Article number045004
JournalProceedings of Meetings on Acoustics
StatePublished - 2012
Externally publishedYes
Event163rd Meeting Acoustical Society of America/ACOUSTCS 2012 - Hong Kong, Hong Kong
Duration: May 13 2012May 18 2012

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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