950-70017001/Iss 1.2
EQ-55 Operators Manual
Page 3.4
Principles of Operation of an Echo Sounder
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
3.1.4
Transducer(s)
A transducer is composed of a number of elements embedded in a housing which
has been reinforced with polyester or fiberglass. The transducer is attached
horizontally to the bottom of the hull.
It is essential that the transducer be
mounted properly
as echo transmissions are radiated at right angles from the
transducer face. Shielded cables connect the transducer with the echo sounder.
3.2
HOW THE EQ-55 WORKS
When the EQ-55 is turned on the
processor begins to send an electrical
voltage to the transducer. The
cylindrical resonators in the transducer
have a special property which enables
them 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 3.1
Figure 3.1
Transmitted “ping”
from the receiver/transmitter
Summary of Contents for EQ 55
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