Abstract
Until present, air-coupled (non-contact) ultrasonic excitation has not been routinely used in nondestructive testing of polymers and composites. It is believed that, by combining this stimulation technique with high-sensitive laser vibrometry, it would be possible to ensure acceptable quality of inspection avoiding any external influence on materials to be tested. This study is devoted to analyzing an ultrasonic inspection system including a non-contact magnetostrictive transducer and sa canning laser dopler vibrometer in application to nondestructive testing of polymeric and composite materials. The use of the magnetostrictor has ensured stimulation power high enough to detect hidden defects, provided that the experimental procedure has been appropriately optimized. The radiation pattern of the magnetostrictive device has been analyzed to demonstrate peculiarities of combining such type of ultrasonic emitters with a titanium waveguide.
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