Underwater electromagnetic tubulent velocimeter

Details Underwater electromagnetic tubulent velocimeter Underwater electromagnetic tubulent velocimeter

1988-07-21

1989-07-18

Woodiel, Donald O.

Measuring and testing

Navigation

Ship's log

7386115, G01C 2110, G01F 158

Patent

active

048481467

ABSTRACT:
A velocimeter, comprising a controlled magnetic field source and electric field sensors, the device being flush mounted in a vessel hull. The magnetic source comprises a drive coil which may be energized with either a DC current or an AC current at varous desired frequencies. The turns-area product and applied current are selected based on desired sensitivity. When the drive coil is energized, a uniform magnetic field is produced near the surface of, and normal to, the hull. The thickness of the uniform region is governed by the thickness of the boundary layer in the tubulent region. The magnetic field returns through the vessel hull structure in such a way that divB=0. Inside the coil, near the outboard external surface of the device, a pair of orthogonally disposed electric field sensors are located for measuring the electric field produced as a result of the interaction between the magnetic field and the conductive fluid. The sensors utilize the Lorentz force which develops in the presence of a magnetic field and a moving conductive field. Sensor output is then further processed to extract the tangential velocity components.

REFERENCES:
patent: 3119960 (1964-01-01), Kenyon
patent: 3161047 (1964-12-01), Griswold
patent: 3693439 (1972-09-01), Cushing
patent: 3777561 (1973-12-01), Lewis
patent: 4261210 (1981-04-01), Gardner
patent: 4472966 (1984-09-01), Dumestre III
patent: 4653319 (1987-03-01), Parsonage

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