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Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing

Pieris, D.; Patel, R.; Dryburgh, P.; Hirsch, M.; Li, W.; Sharples, S.D.; Smith, R.; Clare, A.T.; Clark, M.


D. Pieris

P. Dryburgh

M. Hirsch

Senior Research Fellow

S.D. Sharples

Professor of Manufacturing Engineering

Professor of Applied Optics


High-integrity engineering applications such as aerospace will not permit the incorporation of components containing
any structural defects. The current generation of additive manufacturing (AM) platforms yield components with relatively
high levels of defects. The in-line inspection of components built using AM can provide closed-loop feedback and vary
build parameters during fabrication to minimise defects. This article reviews the capability of spatially resolved acoustic
spectroscopy (SRAS) to be used as an inspection tool for detecting defects and characterising microstructure in parts
induced by variations in build parameters. The authors first correlated changes to surface acoustic wave velocity and an
increase in defects to variations in build laser power, then identified changes to the component microstructure caused
by variations in build laser scan strategy. This was carried out using the detected probe light intensity and the measured
surface acoustic velocity.


Pieris, D., Patel, R., Dryburgh, P., Hirsch, M., Li, W., Sharples, S., …Clark, M. (2019). Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing. Insight - Non-Destructive Testing & Condition Monitoring, 61(3), 132-137.

Journal Article Type Article
Acceptance Date Feb 15, 2019
Publication Date Mar 1, 2019
Deposit Date May 1, 2019
Publicly Available Date May 7, 2019
Journal Insight - Non-Destructive Testing and Condition Monitoring
Print ISSN 1354-2575
Electronic ISSN 1754-4904
Publisher British Institute of Non-destructive Testing
Peer Reviewed Peer Reviewed
Volume 61
Issue 3
Pages 132-137
Keywords Mechanical engineering; Materials chemistry; Mechanics of materials; Metals and alloys
Public URL
Publisher URL


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