Direct measurements of equivalent beam angle on hull-mounted transducers
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Measurements for checking the equivalent beam angle on a hullmounted transducer have been made on a standard 38-29/25-E SIMRAD transducer on the Norwegian research vessel "ELDJARN". The measurements were made during a controlled trimming of the vessel above a previously centered calibration sphere. Comparisons with laboratory measurements of the transducer and theory suggest an effect of the hull mounting of less than 0.2 dB in the equivalent beam angle.