Next Events

Logo Seabed Acoustics 2017

Logo Hydro17

read more ...

Applications / User Benefits

Innomar's narrow beam parametric sub-bottom profilers are used worldwide for many tasks and applications during marine explorations and investigations:

  • Geological and geophysical explorations
  • Sediment investigation campaigns for dredging projects
  • Route surveys for pipeline and cable laying projects
  • Search for mineral resources
  • Surveys in small and (ultra) shallow waters, harbours, flood gates, shore zones
  • Search for objects like wrecks, pipelines, sea cables, navigation obstacles, boulders
  • Archaeological investigations for wrecks, historical buildings and settlements
  • Water column imaging / gas seepage monitoring

 

Advantages of Parametric SBP / User Benefits

The Innomar SES-2000 paramatric sub-bottom profilers generate the low-frequency sound beam due to non-linear interaction of two high-intensity sound beams at higher frequencies in the water column beneath the thransducer. Compared to conventional (linear) sound generation this gives the following advantages:

  • Narrow sound beams at low frequencies with small and portable transducers.
  • For the same beamwidth the transducer size (area) is typically reduced by a factor of 100, depending on frequencies.
  • The half-power beam width is nearly the same for all generated frequencies.
  • There are no distinct side lobes for the low-frequent sound beam during transmission, the beam tapers off smoothly. This avoids ambiguities caused by sidelobe-generated spurious signals.
  • The high relative bandwidth (80%) results in very short sound pings without significant ringing effects.
  • Detection of sediment layers and objects with high resolution.
  • Accurate water depth determination due to high-frequent channel of primary frequencies.
  • Lower received reverberation levels, resulting in better penetration.

Compared to conventional towed systems there are additional benefits of the hull- or pole-mounted parametric transducers like

  • no deployment or recovery of tow fishes,
  • better position accuracy,
  • higher availability due to increased weather window,
  • better survey efficiency due to higher possible survey speed,
  • improved vessel manoeuvrability.

 

symbol

Related Documents and Publications