Abstract
Proper interpretation of ultrasonic inspection results for adhesive bonding of thin metal sheets is discussed. Several approaches including pulse‐echo imaging, resonance spectrometry and Lamb wave technique are compared. New method of signal processing based on estimation of cross‐correlation function is proposed. Theoretical speculations are supported by experiments with plane and spherically focused acoustic beams. The practical aspects of discussed methods as well as technical recommendations are provided for developing a specialized inspection system.
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