Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation

Richard J. Smith, Wenqi Li, Jethro Coulson, Matt Clark, Michael Geoffrey Somekh, Steve D. Sharples

Research output: Journal article publicationJournal articleAcademic researchpeer-review

47 Citations (Scopus)


Measuring the grain structure of aerospace materials is very important to understand their mechanical properties and in-service performance. Spatially resolved acoustic spectroscopy is an acoustic technique utilizing surface acoustic waves to map the grain structure of a material. When combined with measurements in multiple acoustic propagation directions, the grain orientation can be obtained by fitting the velocity surface to a model. The new instrument presented here can take thousands of acoustic velocity measurements per second. The spatial and velocity resolution can be adjusted by simple modification to the system; this is discussed in detail by comparison of theoretical expectations with experimental data.
Original languageEnglish
Article number055902
JournalMeasurement Science and Technology
Issue number5
Publication statusPublished - 1 Jan 2014
Externally publishedYes


  • grain orientation
  • laser ultrasound
  • material characterization
  • surface acoustic waves

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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