Description

Side scan sonar is a method of underwater imaging using narrow beams of acoustic energy (sound) transmitted out to each side of the towfish and across the seabed. Sound is reflected back from the seabed topography (and from objects within the water column) to the towfish.

Certain frequencies work better than others, high frequencies such as 500kHz give excellent resolution (<10cm) but the acoustic energy only travels a short distance limiting the scan range to about 100m per channel. Lower frequencies such as 100kHz give relatively lower resolution but the distance that the energy travels is greatly improved being typically up to 300m range per channel.

EGS operates dual frequency (100kHz/500kHz) digital systems to provide high resolution images on the seabed. The isometric images are used to accurately map and measure objects on the seabed. Typically objects larger than 1m are accurately located and measured.

Large swaths of seabed can be covered in a relatively short period, providing the optimum method of mapping the seabed's geological characteristics and/or looking for objects on the seabed.

EGS has a number of systems capable of surveying down to 1,000m depth including the Klein System 2000 and Edgetech 260TD systems.

Typical applications include:

• Submarine cable and oil/gas installation surveys,
• Wreck and object searches (including ordinance),
• Archaeological Surveys.
  

Side-scan Sonar is the industry standard method of providing high resolution mapping of the seabed. Linked with digital acquisition systems, such as C-View, the side scan sonar provides a realtime tool for searching for and measuring objects on the seabed.

       
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