Eddy current proximity sensing means and method useful for deter

Details Eddy current proximity sensing means and method useful for deter Eddy current proximity sensing means and method useful for deter

1990-11-09

1993-09-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324225, 32420716, G01B 714

Patent

active

052472531

ABSTRACT:
In a preferred embodiment, an inductor excited by a square-wave alternating current to produce a magnetic field in the inductor. A member movable in proximity to the inductor causes losses in the magnetic energy, which losses are directly related to the position of the member with respect to the coil. In another aspect of the invention, there is provided an inductor excited by an alternating current and a moving member which includes a ferromagnetic core having disposed thereon a thin sleeve of high resistivity material. In a further aspect of the invention, there is provided an inductor excited by an alternating current and a moving member, the excitation circuit including an oscillator having a positive temperature coefficient of frequency.

REFERENCES:
patent: 3926053 (1975-12-01), Schurrer et al.
patent: 4502006 (1985-02-01), Goodwin et al.
patent: 4779048 (1988-10-01), Aichele
patent: 4797614 (1989-01-01), Nelson
patent: 4950985 (1990-08-01), Voss et al.

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