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Proceedings Paper

Ultrasound lock-in thermography: feasibilities and limitations
Author(s): Alexander Dillenz; Gerhard Busse; Datong Wu
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Paper Abstract

Conventional thermal wave imaging methods based on optical excitation are sensitive to all thermal boundaries and structures. However, if ultrasound is used for energy deposition, areas of enhanced mechanical loss angle are heated up selectively. As defects are usually correlated with an enhanced loss angle, ultrasound lockin thermography (ULT) is a defect-selective NDE method. Thermal wave emission from defects is monitored that are activated by absorption of ultrasound. In this paper we investigate the applicability of ULT for maintenance and inspection. Examples are presented showing the detection of defects in thick composite materials, of vertical cracks in several materials, and of hidden corrosion. Limitations given by the use of ultrasound are also discussed.

Paper Details

Date Published: 10 September 1999
PDF: 6 pages
Proc. SPIE 3827, Diagnostic Imaging Technologies and Industrial Applications, (10 September 1999); doi: 10.1117/12.361008
Show Author Affiliations
Alexander Dillenz, Univ. Stuttgart (Germany)
Gerhard Busse, Univ. Stuttgart (Germany)
Datong Wu, Robert Bosch GmbH (Germany)

Published in SPIE Proceedings Vol. 3827:
Diagnostic Imaging Technologies and Industrial Applications
Jorma Lammasniemi; Herbert Wiggenhauser; Gerhard Busse; Bruce G. Batchelor; Wolfgang Poelzleitner; Gerd Dobmann, Editor(s)

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