Abstract
Elastic waves launched into a component by an ultrasonic transducer propagate inside the sample until they are converted into heat. A defect causes locally enhanced losses and consequently selective heating. Therefore amplitude modulation of the injected elastic wave turns a defect into a thermal wave transmitter whose signal is detected at the surface by lockin thermography that is synchronised to the frequency of amplitude modulation. This way ultrasound lockin thermography (ULT) allows for selective defect detection which enhances the probability of defect detection even in the presence of complicated intact structures. In this paper we report about investigations which are relevant e.g. for maintenance and inspection of aircraft and other safety-relevant areas. Using the phase angle images provided by ULT one can detect hidden corrosion, cracks in rows of rivets, disbonds, impacts, and delaminations.
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