Directional properties of an 18-kHz transducer
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Several theoretical measures of directivity are given for an 18-kHz transducer that is used in both single-beam and split-beam applications, namely the SIMRAD transducer type 18-11 in the single-beam variant. These are based on an idealized representation of the transducer as a planar array of amplitude-weighted circular elements, with nominal specified parameters. The computed measures of directivity include the average beamwidth at -3 dB level, directivity index, and volume reverberation index, together with related measure of equivalent beam angle.