Abstract
Ultrasonic spark sources have qualities propitious to non-destructive testing of materials in air. They are energetic, and they generate a short acoustic pulse which bandwidth extends from a few hundred Hertz to several hundred kilohertz. It is shown here that by focusing the cylindrically symmetric wavefront generated by the spark with an elliptical mirror, it is possible to concentrate the acoustic energy on the focal line image of the spark. This technique provides a powerful virtual source of small dimension, which may be localized on the surface of the material to be inspected. The performance of this source for non-contact inspection in transmission of composite materials is evaluated by measurements on test samples. The lateral spatial resolution and the high frequency limitation of this technique are determined.
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