Nominal performance measures for two 710-kHz transducers
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Two new transducers have been designed by SIMRAD for the EK500 echo sounding system. The nominal operating frequency is 710 kHz. Each transducer is composed of a single, circular, active element, with diameter of 25 or 50 mm. The nominal equivalent beam angle and directivity index are computed for each of these. It is argued that the computed values are more appropriate for ordinary applications in which a transducer is mounted on a large supporting surface, for example, a vessel hull, than are control measurements of the same transducer when minimally mounted or supported.