Abstract
A transducer which generates a uniform axial and lateral intensity is described. The transducer consists of two concentric high electrodes, an inner disc and an outer ring, the dimensions of which are chosen so that the position of the last axial intensity maximum of the inner disc coincides with the position of the last axial intensity minimum of the large disc obtained when the two high electrodes are shorted. To obtain a uniform field, a higher voltage is applied to the disc electrode. The main feature of the transducer is that the degree of uniformity may be controlled by adjusting the voltage drive ratio. The same transducer may be used to produce a focused field, by applying voltages which are 180° out of phase.
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