Page 60: of Marine Technology Magazine (May 2006)

60 MTR May 2006 suspended material in the water col- umn. By comparing the response at different frequencies, particle size can be inferred, designed to simplify sus- pended load estimation. Data is avail- able as a time-averaged series of pro- files, with spatial resolution to at least a centimeter and timing resolution of less than a second. The following three types of AQUAscat are now available, with sales already recorded to European and US customers: The

Survey model, the Research model, and the Laboratory model.

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HISAS Synthetic

Aperture Sonar

The HISAS Synthetic Aperture

Sonar prototype has recently been tested with success at sea off Horten,

Norway, with signal processing com- pleted by the Norwegian Defense

Research Establishment (FFI).

The image is from the test and shows a sunken wreck standing upright on the bottom. It has a reso- lution of about 4 cm both along track and across, each acoustic beam being processed from 40 consecutive pings.

Synthetic Aperture Sonar (SAS) combines a number of acoustic pings to form an image with much higher resolution than conventional sonar, typically 5-20 times higher the com- pany reports. HISAS is a wideband

SAS with frequency range of 70- 100kHz, capable of producing ultra high resolution acoustic images as well as co-registered bathymetry.

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The EVOLeye-SL60HT from EV Offshore

The EVOLeye-SL60HT Camera from EV Offshore Ltd. has been con- figured for trace dye leak detection applications. The camera features an array of Green LED's used to excite

Red Trace dye complete with optical filters to optimize its visible spectrum performance.

Using industry standard configura- tion, it can be retro-fitted onto exist- ing equipment. Available in a range of housings to suit depth and size requirements. The SL60HT is sup- plied complete with a color camera as standard.

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Mariner Shuttle for

Ecosystem Monitoring

The new Chelsea Mariner Nu-

Shuttle is based on the Nu-Shuttle towed oceanographic vehicle. It is a generic, robust monitoring system designed for regular monitoring of large marine ecosystems. Undulating behind a research vessel or ship of opportunity it enables a wide range of oceanographic measurements to be made underway from the surface to depths in excess of 150 m.

Temperature, salinity, chlorophyll, dissolved oxygen, plankton photosyn- thesis, plankton sampling, optical plankton counting and nutrients are all measured in real-time with the data displayed on the ship. Large

Marine Ecosystems are regions of ocean space encompassing coastal areas from river basins and estuaries to the seaward boundaries of conti- nental shelves and the outer margins of the major current systems. They are relatively large regions of 200,000 sq. km or greater, characterized by distinct bathymetry, hydrography, productivity, and trophically depend- ent populations.

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FREE INFORMATION on products is available online at www.maritimeequipment.com/mt products

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