"STING Mk.II"™ A new service offered by
Coastal Geoscience Research
Coastal Geoscience Research is pleased to introduce
to the oceanographic, environmental and underwater survey
communities the next generation of the Seabed Terminal Impact
Newton Gradiometer, STING Mk.11. This unique free-fall penetrometer
provides a powerful and cost-effective alternative to the methods
commonly used for determining the dynamic load bearing strength
of the seabed.
STING is a self-contained, tethered probe with a streamlined body and a long (up to three metres), slender steel shaft protruding from the nose cone. The unit is released from a vessel so that it drops freely through the water, reaching terminal velocity, and impacts into the sea floor vertically with its calibrated shaft and foot. Internal microprocessor-based electronics record the deceleration as the shaft embeds itself into the layers of the bottom sediment. Since a typical seabed impact event lasts under a second, it is possible to commit multiple impacts to the built-in memory bank. Successive drops can be performed during a single deployment by simply raising the probe several metres off the bottom. After the unit is brought back to the surface the data is downloaded to a PC workstation. Sophisticated analysis software, included with the probe, determines various kinematic parameters for each impact event and computes an estimate of the seabed bearing strength.
Data acquisition can be initiated by water immersion or optionally by hydrostatic pressure level. The immersion (conductivity) switch starts the acquisition as soon as a pair of electrodes is shorted by the water. The conductivity trip point is menu driven and may be set for different salinity levels, including fresh water. Units equipped with the optional depth measurement system may be programmed to start the data logging process at a predetermined water depth, thus economizing memory usage. The depth measurements may be recorded alongside the acceleration data if so desired.
Applications for STING include...
The system consists of...