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The technique of sonic infrared imaging (SIR) consists of the excitation of an object with a short pulse of 15 to 40 kHz sound, in combination with IR imaging of the object’s surface temperature as a function of time. Sonic infrared imaging is effective for detecting surface and subsurface cracks. The recent discovery of acoustic chaos has provided a means of greatly enhancing the effectiveness of SIR. We describe the properties of chaotic sound in the context of SIR crack detection, and show examples of the enhancement of the detectability of cracks through the use of chaotic sound. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Presents information on a study which examined thermal wave reflections from a plane boundary, such as the back wall of a solid slab, following pulsed heating of the front surface of the slab. Methodology of the study; Results and discussion on the study; Conclusions.