Konsberg EM 124, Руководство по установке

Страница: 13 / 212

443140/A
13
System units
Topics
Transducer description, page 13
Transmitter Unit description, page 14
Receiver Unit description, page 14
Processing Unit description, page 14
Hydrographic Work Station description, page 15
Transducer description
A transducer is a device that converts one form of energy to another. In an echo sounder
system the transducer converts between electric energy and sound.
Receive transducer module
The EM 124 uses separate transducer arrays for
transmitting and receiving sound pulses. Both
transducer arrays have several modules which are
assembled in mounting frames.
The two transducer arrays are normally mounted as
“T” or “L” configurations under the vessel’s hull (Mills
Cross configuration). The transmit transducer array
should be aligned parallel to the vessel’s keel. The
receiver transducer array should be aligned 90 degrees on the keel. Both transducer
arrays should be horizontal on a plane on the keel.
The transmit transducer array contains up to 96 modules in accordance with the chosen
beamwidth. Each module contains 18 elements arranged in rows of 6 elements. Each
element is individually connected to its corresponding transmitter in the Transmitter
Unit(s). It can thus be driven with an unique amplitude level and phase to allow forming
of the required transmit sectors with individual steering.
The receive transducer contains up to 16 modules in accordance with the chosen
beamwidth. Each module contains 8 transducer staves, and these have individual
electrical connections to their corresponding preamplifiers in the Receiver Unit(s). Each
stave can thus be given unique amplitude and phase control to allow forming of the
required receive beams.
Kongsberg EM 124