Abstract
Kirchhoff's formula is used to compute the directivity pattern and the source level of a large cylindrical transducer from measurements made near the transducer. Directivity patterns are computed for a plane normal to the axis of the cylinder and a plane which contains the axis of the cylinder. The normal pressure gradient required in the formula is obtained by a simple approximation, and the computations are carried out by means of a numerical integration over the surface of a circular cylinder of finite length. Data have been taken by making various numbers of passes around the transducer at different positions along the axis with a probe hydrophone, or by making one pass with a line hydrophone. There is good agreement between measured and computed patterns and source levels. (This work is supported by the Bureau of Ships.)
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