Abstract
In underwater acoustics, transducers are often placed in some kind of a baffle. Then the farfield radiation patterns of the transducers vary with the property of the baffle and its size and shape. This paper describes the basic characteristics of the influence of a baffle due to its size and shape. Two shapes of baffles are treated to investigate the influence: (1) a three-sided semi-infinite baffle with a piston flush mounted in its middle side and (2) a semi-infinite circular cylinder baffle with a piston in its end side, both having either rigid or soft property. The geometrical theory of diffraction is used to calculate the farfield radiation patterns of the piston in the case of the middle side and the method of equivalent edge acoustic sources in that of the end side. Numerical results obtained with the methods in various baffle sizes and piston locations are presented. Measured patterns, which agree well with calculated ones in soft condition, are also presented.
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