Transducerless Method for Ultrasonic Flaw Testing in Metals

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Abstract
An ultrasonic method for detecting flaws in metals has been developed which does not require physical contact with the metal in order to excite or detect the ultrasonic signal. The method of direct electromagnetic generation of ultrasound in the presence of magnetic fields has been used to detect both artificial flaws and naturally occuring inhomogeneities in aluminum bars and rods. Results are presented which demonstrate that this technique may offer some advantage over conventional transducer methods.

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