| definition |
- ScanFish is a towed undulating vehicle system designed for collecting
profile data of the water column in oceanographic, bathymetric and
environmental monitoring applications at either fixed depth or to pre-
programmed undulating flight path.
The ScanFish MK II is an active unit, which generates an up or down force in
order to position the tow-fish in the water column. It is towed from a tow
point placed in a cut in the centre line from the leading edge of the fish
body. This tow point allows the cable to pivot ± 90° about a transverse axis
just forward of the centre of lift providing maximum control while ensuring
very good pitch stability resulting in an excellent symmetrical saw tooth
profile.
To give the control system feedback for the flap control, the ScanFish is
equipped with pitch and roll sensors together with feedback sensors on the
flaps. The feedback is also used to control the fish, so that it always flies
in a horizontal position - without roll - and during launch to ensure that the
fish turns itself upright and level, in case the fish was "flipped over" when
lowered into the water.
This instrument may carry a number of sensors measuring parameters like
conductivity (salinity), temperature, pressure, fluorescence,
photosynthetically active radiation (PAR) and other parameters.
[Summary adapted from http://www.eiva.dk/sw316.asp]
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