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System diagram

The basic Simrad ME70 system comprises a computer, one or more transceivers, and the necessary transducers for the requested operating frequencies.

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(A) Display (the second display is optional)
(B) Processor Unit (computer)
(C) Trandsucer
(D) Power Supply (3)
(E) Transceiver Unit

The basic Simrad ME70 system consists of one transducer, Transceiver Unit and a Processor Unit (computer).

Installation drawings

Outline dimension and production drawings are provided in PDF and DWG formats. Use the link to open the drawings page in a new window.

Display

A display is a required part of the multibeam system. Any commercial display can be used provided that it meets the minimum requirements. You may wish to see many echogram channels simultaneously. A large display with high resolution is then useful. The multibeam software supports all display sizes. The visual quality of the echogram presentations depend on the quality of your graphic adapter and display.

The display is not a standard part of the delivery. This is a commercial item that can be purchased locally.

Processor Unit

The Processor Unit comprises a single powerful maritime computer. It is provided as a standard part of the delivery. It serves several functions.

The Processsor Unit handles the advanced signal processing required to present the information on the display, and it allows you to control the echo sounder system. It provides the graphic presentation of the echograms and images that are created, it holds the menu system, it communicates with the transceiver, and reads information from the peripheral units. The Processor Unit is a marine computer using the Microsoft Windows® operating system. It is designed for rugged use, and placed on shock absorbers. The computer is based on a commercial design, but the software and hardware has been specified and assembled specifically to meet the scientific echo sounder requirements.

transceivers Unit

The Transceiver Unit contains the transmission and reception circuitry for the multibeam echo sounder.

The Simrad ME70 transceiver is provided to transmit the acoustic energy into the water. To do this, the transceiver computes and generates the electric signals sent to the transducer to form a transmission - a 'ping'. After each transmission, it will receive the echoes from the targets in the water column and/or the seabed. These are filtered and amplified, and then converted to digital format.

Transducer

The Simrad ME70 is a short cylindrical container with 800 transducer elements. Several operational frequencies is available.

HOW IT WORKS

The transducer converts the electric energy generated by the transceiver to physical vibrations. These vibrations alter the water pressure, and create an acoustic pulse that is sent into the water. The acoustic signal is transmitted as a beam. The duration of the acoustic pulse, as well as its frequency and shape, are controlled by the transceiver. The direction and opening angle of the beam is controlled by the transceiver and the physical properties of the transducer.

After the transmission, the transducer works as a "microphone". It converts the water pressure created by the acoustic echoes to electric energy. These weak echo signals are sent to the amplifiers in the transceiver.

TRANSDUCER HANDLING

Note: The red protective coating is an vital part of the transducer. It is very important that neither this coating nor the internal parts of the transducer are damaged during the handling, installation or cleaning. Any holes and/or scratches in the transducer surface will allow water to penetrate the transducer. If a leak occurs, the transducer must be replaced.

The transducer must always be handled as a delicate item. Wrongful actions may damage the transducer beyond repair. Observe these transducer handling rules:

  • Do not activate the transducer when it is out of the water.
  • Do not lift the transducer by the cables.
  • Do not step on the transducer cables.
  • Do not damage the transducer cables, avoid sharp objects.
  • Do not handle the transducer roughly, avoid impacts.
  • Do not expose the transducer to direct sunlight or excessive heat.
  • Do not use high pressure water, sand blasting, metal tools or strong solvents to clean the transducer face.
  • Do not damage the outer protective skin on the transducer.

Power Supply Units 

Three Power Supply Units are provided with the ME70. Each unit provide operational voltages to a dedicated TRXU subrack in the Transceiver Unit.

The power supplies are controlled from the Processor Unit. The connection is made using three Ethernet cables from the Ethernet switch in the Transceiver Unit.