Abstract
In order to improve conventional ultrasonic testing of near-surface component regions a holographic system has been developed, enabling sensitive detection and large area visualization of ultrasonic waves insonified at the component surface. Near-surface flaws, e.g. cracks, are thus indicated by distinct disturbances of the interference fringes representing the free-running ultrasonic wave in the interferogram. Besides the discussion of the basic principles of the system the inherent possibilities in nondestructive testing as well as the limitations of this technique with respect to flaw detection and flaw description (size, shape, location) will be discussed. Practical applications in testing thermally sprayed coatings and thinwalled components will be presented. First results with respect to visualization of laser-induced ultrasonic waves as well as developments in computer-aided flaw detection and description will be presented.
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