An Expendable Temperature and Velocity Profiler (XTVP),
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
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An expendable instrument is described for measuring vertical profiles of relative horizontal velocity and temperature in the upper 750 meters of the ocean. The velocity determinations are based on the principles of electromagnetic induction which govern the weak electric currents induced by the motion of sea water through the earths magnetic field. The resulting electric current profile corresponds to the velocity profile relative to an unknown, depth-independent reference velocity. The method yields this relative velocity profile with a vertical resolution of 10 meters and an uncertainty of 1 cms rms. With a remote surface release to remove probe from the electric and magnetic disturbances of a vessel the instrument performs well from the surface to 750 meters.