Grain Structure Identification by Ultrasound Frequency Averaging and Deconvolution.
Abstract
The goal of this research project is to measure local grain size and concentration deep in the interior of a medium ultrasonically. It will be shown that information on the scatterers' statistics can be obtained if either the field structure or the scatterer density exhibits gradients. It will be shown theoretically, and by numerical computation, that the received echo from a configuration of piston transmitter and a point receiver in the center of the piston contains a coherent component which should allow concentration estimation. This report will also show theoretically and confirm experimentally that a gradient in scattering concentration will return a coherent echo from whose degree of coherence the scatterer concentration can be estimated. We expect to apply these results soon to the estimation of grain size inside a medium. Additional keywords: Coherent scattering; Estimates; Statistics; Microstructure; Nondestructive testing. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 29, 1985
- Accession Number
- ADA154332
Entities
People
- I. Amir
- S. Nash
- V. L. Newhouse
- Yu Ge
Organizations
- Drexel University