EM124

Multibeam echo sounder

The modular, state-of-the-art EM 124 performs accurate, high resolution seabed mapping in shallow to full ocean depth. The successor to the EM 122, the EM 124’s broad range of functionality supports simultaneous collection of multiple data types, saving time in the planning, execution and analysis phase. A low noise echo sounder, EM 124 delivers superior data that requires minimal post-processing.

Tags

  • Multibeam echo sounder software
  • Echo sounder
  • Sonar
  • Sub-bottom profiler
  • Positioning & attitude
  • Multibeam
  • High-resolution sonar
  • Multibeam echo sounder

Modular and Flexible Design

The EM 124 consist of new state-of-the-art electronics and separate transmit and receive transducers in a Mills Cross configuration. It utilizes the same field-proven transducers as the EM 122, making it easy to upgrade. Care has been taken to design a highly, modular and flexible solution with compact electronics for easier and faster installation. Due to a flexible transducer design, the system can be tailored to almost any required size. The largest standard size, 0.5 x 1 degrees, gives the ultimate system performance in terms of resolution and range, while a smaller 4 x 4 degrees solution allowing full ocean depth surveys even on smaller vessels.

Clean and High Resolution Data

Due to the sector transmission technique, the system produces a strong dampening of multi-bounce interference from false echo, resulting in significantly cleaner data. Near field beam focus is applied in real time, both during transmission and reception. Due to sector transmission the focal point will be individual for each sector, resulting in a much sharper transmit beam over the entire swath. On reception, the focus is done dynamically for each beam. The result is a much higher resolution representation of the seabed.

Full Seabed Coverage

The transmit fan is divided into up to 16 individual sectors in dual swath mode. This allows for unique control of the transmit fan, enabling active stabilization in real time to correct for any yaw and pitch movement of the vessel, while roll stabilization is applied on the receiving beams. The result is a stabilized system for full ensonification of the seabed with equally distributed footprints, even in bad weather conditions, leaving no gaps or holes in the mapped area. All beams are maintained and automatically adjusted according to achievable coverage or operator defined limits. Up to 1600 individual beams are available in dual swath mode. Two individual transmitting fans are generated with a small difference in tilt giving a constant sounding pattern on the seafloor.

Key features

  • Modular design
  • High resolution
  • Wide frequency range
  • FM chirp
  • Roll, pitch, and yaw stabilization
  • Transmit and receive nearfield focusing
  • Water column display and logging
  • Water column phase logging
  • Seabed image
  • Dual swath
  • Extra detections
  • Mammal protection

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