Abstract
A superficial crack on an aluminum plate becomes an internal flaw when covered by a second plate. Ultrasonic waves are caused to resonate between the external surfaces of the plates and produce transmission maxima characteristic of Lamb modes in the plates. The transmitted wave fronts in a liquid, modified by the presence of the flaw, are now used to diffract light at the Bragg angle. The Bragg diffraction orders contain images of the ultrasonic wave fronts and, hence, can be used to image the internal flaws. Characteristic flaws are shown and resolution limits are discussed. [Research supported by the U.S. Office of Naval Research and by the UT-ORNL Science Alliance.]
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