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10 April 2007 Studying the effect of coupling materials in sonic IR imaging
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Sonic infrared (IR) Imaging employs a short ultrasonic pulse excitation and Infrared Imaging to detect defects in materials and structures. The ultrasound pulse, typically a fraction of a second, causes heating in the defects, which results in the change of IR radiation from the target. This change can be detected by infrared sensors, thus, defects can be identified. One key objective in developing this technology is to optimize the IR signal with minimum ultrasound excitation energy being applied to the target. We have learned that the ultrasonic frequency, coupling medium between the ultrasonic transducer and the target, the pressure from the transducer to the target, the characteristics of the target itself, etc. are all factors that affect the IR signals. In a previous paper at this conference, we presented the thermal energy computing tools developed for analyzing IR data. In this paper, we present the results of our study on the effect of different coupling materials on IR signal levels for different types of materials.
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Xiaoyan Han and Rui Yu "Studying the effect of coupling materials in sonic IR imaging", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 652937 (10 April 2007);

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