Simrad EQ42 Specifications download pdf (Page 49)

EQ33 Principles of operation Chapter 8-3

8.3 Transducer beam width

The transducer mounted to the hull of your vessel serves as both a ‘speaker’

when transmitting, and as a ‘microphone’ when the echosounder is receiv-

ing. Similar to the way a flashlight focuses light, most of the sound from your

transducer is focused downwards with a smaller amount going out to the sides.

The amount of focusing of the sound beam is expressed as a ‘beam width’.

Transducer

Approximation of the sound

pattern below the transducer

This angle is the transducer’s

beam width

1/2 maximum intensity

Maximum intensity

Fig. 3 A representation of a transducer beam width.

The center of the sound beam is the most intense, then as you move out

towards the sides of the sound beam there is a point where the intensity of

the sound is half what it was in the center. The distance moved is the ‘beam

width’. See Fig. 3.

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Simrad EQ42 Specifications Page 49