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current meter
A current meter is oceanographic device for flow measurement by mechanical (rotor current meter), tilt (Tilt Current Meter), acoustical (ADCP) or electrical means.
==Different reference frames==
In physics, one distinguishes different reference frames depending on where the observer is located, this is the basics for
the Lagrangian and Eulerian specification of the flow field in fluid dynamics: The observer can be either in the Moving frame (as for a Lagrangian drifter) or at in a resting frame.
* Lagrangian current meters measure the displacement of an oceanographic drifter, an unmoored buoy or a non-anchored ship's actual position to the position predicted by dead reckoning.
* Eulerian current meters measure current passing a resting current meter.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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