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Spatially resolved acoustic spectroscopy additive manufacturing: towards online inspection

Milesh Pieris, Don; Patel, Rikesh; Dryburgh, Paul; Hirsch, Matthias; Li, Wenqi; Sharples, Steve D.; Smith, Richard J.; Clare, Adam T.; Clark, Matt


Don Milesh Pieris

Paul Dryburgh

Matthias Hirsch

Senior Research Fellow

Steve D. Sharples

Richard J. Smith

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 platforms yield components with relatively high levels of defects. The in-line inspection of the components built using additive can provide closed-loop feedback and vary build parameters during fabrication to minimise such defects. This article reviews the capability of spatially resolved acoustic spectroscopy to be used as an in-line inspection tool for detecting the changes in parts induced due to variations in build parameters. The first considers the build laser power and the second varies the laser scan strategy used to build the component. Using the detected probe light intensity map and the measured surface acoustic velocity, the detection of surface defects, subsurface defects and component microstructure can be measured.


Milesh Pieris, D., Patel, R., Dryburgh, P., Hirsch, M., Li, W., Sharples, S. D., …Clark, M. (2018). Spatially resolved acoustic spectroscopy additive manufacturing: towards online inspection. In n/a

Conference Name 57th The British Institue of Non-destructive Testing Annual Conference
Start Date Sep 10, 2018
End Date Sep 12, 2018
Acceptance Date Aug 13, 2018
Publication Date Sep 10, 2018
Deposit Date Oct 25, 2018
Publicly Available Date Oct 26, 2018
Book Title n/a
Chapter Number n/a
ISBN n/a
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