Abstract
This paper describes an optical technique which can distinguish between a perfect transducer and a transducer with a defect. For some defects this technique is able to classify the particular type of defect. The technique is based on a combination of the theory of light diffraction by ultrasonic fields and the theory of tomography. The experimental set-up uses a 5 mW He-Ne laser, low cost optics and a light intensity meter, with data processing performed by a personal computer. The optical technique has been applied to 4.5 MHz, 25 mm diameter transducers with introduced characteristics defects. Promising results have been obtained.
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