Ultrasound lock-in thermography: feasibilities and limitations

Alexander Dillenz; Gerhard Busse; Datong Wu

doi:10.1117/12.361008

10 September 1999 Ultrasound lock-in thermography: feasibilities and limitations

Alexander Dillenz, Gerhard Busse, Datong Wu

Proceedings Volume 3827, Diagnostic Imaging Technologies and Industrial Applications; (1999) https://doi.org/10.1117/12.361008
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

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.

Citation Download Citation

Alexander Dillenz, Gerhard Busse, and Datong Wu "Ultrasound lock-in thermography: feasibilities and limitations", Proc. SPIE 3827, Diagnostic Imaging Technologies and Industrial Applications, (10 September 1999); https://doi.org/10.1117/12.361008

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