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Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging

Clark, Matt; Clare, Adam; Dryburgh, Paul; Li, Wenqi; Patel, Rikesh; Pieris, Don; Sharples, Steve; Smith, Richard


Professor of Applied Optics

Professor of Manufacturing Engineering

Paul Dryburgh

Senior Research Fellow

Don Pieris

Steve Sharples


© 2019 Author(s). Spatially resolved acoustic spectroscopy (SRAS) is an acoustic microscopy technique that can image the microstructure and measure the crystallographic orientation of grains or crystals in the material. It works by measuring the velocity of surface acoustic waves (SAWs) via the acoustic spectrum. In the usual configuration, the SAWs are generated by laser using a pattern of lines and detected by laser at a point close to this grating-like source. The use of the acoustic spectrum as a means of measuring the velocity has a number of practical advantages which makes the technique robust and fast and gives good spatial resolution. This makes the measurement suitable for imaging and gives it many advantages over traditional laser UT and microstructural measurement techniques. As SRAS is a laser ultrasound testing technique (LUT) which can be applied to a wide range of industrially relevant samples as a non-destructive evaluation technique. There are no size limitations on the samples that can be imaged and the surface preparation required is significantly more relaxed than many other techniques with the capability of operating on many as manufactured finishes. This permits the use of SRAS as an online inspection tool, for instance during additive or subtractive manufacturing, as a QA tool during manufacture or as an NDE/T tool in service.


Clark, M., Clare, A., Dryburgh, P., Li, W., Patel, R., Pieris, D., …Smith, R. (2019). Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging. AIP Conference Proceedings, 2102,

Journal Article Type Conference Paper
Conference Name 45th Annual Review of Progress in Quanitative Nondestructive Evaluation
Conference Location Vermont, USA
Start Date May 8, 2019
Acceptance Date Apr 8, 2019
Online Publication Date May 8, 2019
Publication Date May 8, 2019
Deposit Date May 21, 2019
Publicly Available Date May 9, 2020
Journal AIP Conference Proceedings
Print ISSN 0094-243X
Electronic ISSN 1551-7616
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 2102
Article Number 020001
Public URL
Publisher URL
Additional Information This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging, Matt Clark, Adam Clare, Paul Dryburgh, Wenqi Li, Rikesh Patel, Don Pieris, Steve Sharples, and Richard Smith, AIP Conference Proceedings 2102, 020001 (2019) and may be found at


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