Ultrasonic properties of transducer backings |
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Authors: | C.M. Sayers C.E. Tait |
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Affiliation: | Materials Physics Division, AERE, Harwell, Oxfordshire, UK |
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Abstract: | For non-destructive testing applications it is often necessary to limit the number of cycles in a pulse produced by ultrasonic transducers. Usually a backing with a high ultrasonic attenuation and with an acoustic impedance chosen to match that of the piezoelectric active element of the transducer is employed. The acoustic properties of the commonly used tungsten/Araldite backings are compared theoretically with those of composites made by pressing tungsten powder with a powder of a plastic metal. The change in ultrasonic velocity and attenuation due to scattering by the tungsten particles is investigated and the dependence on frequency is determined. |
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Keywords: | ultrasonics transducers tungsten epoxy resin |
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