Titlebook: Ultrasonic Testing of Materials; Josef Krautkr?mer,Herbert Krautkr?mer Book 19833rd edition Springer-Verlag Berlin Heidelberg 1983 Materia

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Other Methods for Transmitting and Receiving Ultrasoundompared with the piezoelectric oscillator, which is coupled to the workpiece, the surface of the work piece forms in the case of these “direct” methods a part of the acoustic transducer. The direct or dry methods thus require no coupling medium, so avoiding some of the difficulties analysed in the next paragraph.

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