Characterization of micro and nano layers using frequency domain laser-ultrasound

Author

Grunsteidl, C.M. ; Roither, J. ; Veres, Istvan A. ; Berer, Thomas ; Burgholzer, Peter ; Murray, T.W.

Author_Institution

Res. Center for Non-Destruct. Testing GmbH, Linz, Austria

fYear

2013

fDate

21-25 July 2013

Firstpage

1583

Lastpage

1586

Abstract

The presented work deals with the characterization of thin coatings with the help of their acoustic dispersion relation. Surface acoustic waves are excited and detected by a laser-ultrasound setup. The setup applies a superheterodyne principle which allows detection up to 1 GHz. This method provides high signal-to-noise ratios at low optical powers. A numerical model and an optimization algorithm are used to characterize the layers by their thickness and elastic properties.

Keywords

acoustic dispersion; acoustic noise; acoustic signal processing; dispersion relations; elasticity; frequency-domain analysis; optimisation; surface acoustic waves; ultrasonics; acoustic dispersion relation; elastic properties; frequency domain laser-ultrasound; numerical model; optimization algorithm; signal-to-noise ratios; superheterodyne principle; surface acoustic waves; thin coatings; Coatings; Dispersion; Frequency modulation; Frequency-domain analysis; Laser excitation; Measurement by laser beam; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2013 IEEE International

Conference_Location

Prague

ISSN

1948-5719

Print_ISBN

978-1-4673-5684-8

Type

conf

DOI

10.1109/ULTSYM.2013.0403

Filename

6725137