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| ScanFish MK II Download PDF |
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ScanFish MK II is a towed undulating vehicle system designed for collecting profile data of the water column in oceanographic, bathymetric and environmental monitoring applications. The system comprise:
- Control PC with ScanFish System Software
- Deck unit (PowCom)
- ScanFish tow vehicle with controller and sensor package
- Winch and tow cable
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. |
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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.
During most operations the tow cable will be lightly loaded. Only when the fish is required to pull downwards forcibly will the cable be correspondingly loaded. In typical undulation mode this will be less than 5% of the mission time. When the fish is near surface the tow cable will be fairly slack, and even violent heaving and pitching motions of the towing vessel will have negligible influence on the flight of the ScanFish.
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