Abstract
Amplitude distributions of ultrasonic waves (longitudinal, 10 MHz) generated electromagnetically at a surface of an aluminum rod are investigated for some arrangements of a several turned rectangular coil which is placed close to the surface and can be moved parallel to it. A quartz transducer (X-cut, 10 MHz) attached to the opposite surface of the rod is used as a receiver, and close agreement is obtained between the observed and calculated distributions of the detected voltage. Also it is pointed out that the phases of waves generated by such a method are generally not uniform over the cross section of the rod, but in case the coil plane is placed parallel to the surface of the rod, the phases of waves become rather uniform, if a half the area of that surface with the thickness of half a wavelength is cut off.
Published Version
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