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Drifter (floating device)
A drifter (also float) is an oceanographic device floating on the surface or at a given water depth to investigate ocean currents and other parameters like temperature or salinity. They are also called Lagrangian drifters since they follow the flow in a Lagrangian manner.
The depth of drifter is defined by its neutral buoyancy. The device stops sinking when its buoyancy force is in equilibrium with its gravitational force.
==Construction principle==
The major component of a drifter are hollow bodies that ensure flotation, underwater-sails to catch water currents, instruments (e.g., data collecting instruments, transmitters to transmit the collected data, and GPS devices), and waterproof containers for instruments.〔("Drifters" )〕〔("Dissect a Drifter" )〕 Drifters are a hi-tech evolution of the ocean current analysis by means of drift bottles, which in their turn evolved from simple collection of data about messages in a bottle.
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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