Acoustic systems including multibeam echosounders

Technical details

Kongsberg EM122

• Full ocean depth multibeam echosounder (MBES) used primarily for bathymetry and bottom characterisation.
• Operating frequency is 12 kHz.
• Number of beams is 288.
• Horizontal resolution is 1 x 1 degree.
• Maximum width is 6 times water depth or 30 km or 143 degrees.
• Depth range is 50-11,500 m.

Kongsberg EM710

• Shallow to mid depth (maximum 2000m) multibeam echosounder used primarily for bathymetry and bottom characterisation.
• Operating frequencies are 70-100 kHz.
• Number of beams is 400.
• Horizontal resolution is 0.5 x 1 degree.
• Maximum width is 5.5timesx water depth or 2300 m or 140 degrees.
• Depth range is 3–2000 m, with optimum depth range 600-700 m.

SBP120

• Sub-bottom profiler to resolve sediment layers and buried objects.
• Operating frequencies are 2 – 8 kHz and 12kHz.
• Horizontal resolution is 3 x 3 degrees.
• Seafloor penetration depends on sediment type but extends up to tens of metres.

12kHz transducer

• Single beam bathymetry and underwater communications such as acoustic releasers and pingers.
• Operating frequency is 12 kHz.

75kHz ADCP

• Deep (to 700m) current profiler.

150kHz ADCP

• Mid-depth (to 400m) current profiler

ITI Net Monitoring System

• Trawl net monitoring.
• Linked to the SH90 for targeted trawling.

USBL

• Provides location of deployed instruments relative to the ship.

Dual Axis Doppler Log

• Speed and direction of the ship relative to the water.

Sound Velocity Probe

• Measures sound velocity in water at the depth of transducers and is used in multibeam beam forming.

Hydrophones

• Four hull mounted hydrophones provide capability for ship self noise and underwater acoustics monitoring.

Technical details

Kongsberg EM122

• Full ocean depth multibeam echosounder (MBES) used primarily for bathymetry and bottom characterisation.
• Operating frequency is 12 kHz.
• Number of beams is 288.
• Horizontal resolution is 1 x 1 degree.
• Maximum width is 6 times water depth or 30 km or 143 degrees.
• Depth range is 50-11,500 m.

Kongsberg EM710

• Shallow to mid depth (maximum 2000m) multibeam echosounder used primarily for bathymetry and bottom characterisation.
• Operating frequencies are 70-100 kHz.
• Number of beams is 400.
• Horizontal resolution is 0.5 x 1 degree.
• Maximum width is 5.5timesx water depth or 2300 m or 140 degrees.
• Depth range is 3–2000 m, with optimum depth range 600-700 m.

SBP120

• Sub-bottom profiler to resolve sediment layers and buried objects.
• Operating frequencies are 2 – 8 kHz and 12kHz.
• Horizontal resolution is 3 x 3 degrees.
• Seafloor penetration depends on sediment type but extends up to tens of metres.

12kHz transducer

• Single beam bathymetry and underwater communications such as acoustic releasers and pingers.
• Operating frequency is 12 kHz.

75kHz ADCP

• Deep (to 700m) current profiler.

150kHz ADCP

• Mid-depth (to 400m) current profiler

ITI Net Monitoring System

• Trawl net monitoring.
• Linked to the SH90 for targeted trawling.

USBL

• Provides location of deployed instruments relative to the ship.

Dual Axis Doppler Log

• Speed and direction of the ship relative to the water.

Sound Velocity Probe

• Measures sound velocity in water at the depth of transducers and is used in multibeam beam forming.

Hydrophones

• Four hull mounted hydrophones provide capability for ship self noise and underwater acoustics monitoring.