Simrad EQ 55 Dokumentacja Pobierz pdf (Strona 26)

The transducer is attached horizontally to the bottom of the hull. )TIS

ESSENTIALTHATTHETRANSDUCERBEMOUNTEDPROPERLY (see chapter 5 In-

stallation and service), as echo transmissions are radiated at right angles

from the transducer face. Shielded cables connect the transducer with the

echosounder.

When the EQ32 MKII is turned on the proc-

essor begins to send electrical pulses to the

transducer. The ceramic resonator in the

transducer has a special property which en-

ables it to change dimensions slightly when

a varying voltage is applied. The voltage is

thus converted to mechanical vibrations

(sound waves) which are then transmitted

down through the water. See Figure 1

The sound waves move through the water

until they encounter a change in density,

such as a fish or the bottom. This causes the

sound waves to "echo" back up through the

water. When the reflected sound waves (ech-

oes) hit the transducer the ceramic disk vi-

brates at the same frequency. This generates

a vaying voltage between the disk surfaces.

This voltage goes back up through the cable

to the receiver. The EQ32 MKII processes

the signals and presents them on the display

screen. See Figure 2

(OWTHE%1-+))WORKS

Figure 1 - Transmitted ’ping’ from

the receiver/transmitter.

Figure 2 - Echoes returning to the

receiver.

Transmitted

pulse

Echo from

the fish

Fish

#HAPTER 0RINCIPLESOFOPERATIONOFANECHOSOUNDER

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Simrad EQ 55 Dokumentacja Strona 26