Directional properties of an 18-kHz transducer
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http://hdl.handle.net/11250/105137Utgivelsesdato
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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.