Eddy current position sensor including an insulating base having

Details Eddy current position sensor including an insulating base having Eddy current position sensor including an insulating base having

1994-10-31

1996-11-05

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 324260, 174261, G01B 714, G01B 730

Patent

active

055721192

ABSTRACT:
A position sensor includes a coil of small diameter litz wire wound around a ferrite rod. The rod is secured in the end of a ceramic support and an end cap is secured on the other end of the rod to form a bobbin section on which the coil is wound. Two palladium silver strips are formed axially along the length of the support extending from the bobbin section to near the base of the support. Two free ends of the coil are formed into strain relief loops and soldered to the strips. Lead wires of comparatively larger diameter are also soldered to the strips but near the base of the support. The strips establish electrical continuity between the coil and the lead wires while separating the end portions of the coil from the lead wires so as to prevent the lead wires from inducing stress into the relatively fragile coil wires. The lead wires are threaded through a cylindrical metal housing, and the base of the ceramic support is located into a cylindrical recess in the housing to support and seal the working end of the sensor.

REFERENCES:
patent: 3541394 (1970-11-01), Brenneman et al.
patent: 3745509 (1973-07-01), Woodward et al.
patent: 4114960 (1978-09-01), Habermann et al.
patent: 4157612 (1979-06-01), Rainal
patent: 4473259 (1984-09-01), Goldowsky
patent: 4563643 (1986-01-01), Leschek et al.
patent: 4639054 (1987-01-01), Kersbergen
patent: 4931728 (1990-06-01), Hata et al.
patent: 5036236 (1991-07-01), Wilson
patent: 5363033 (1994-11-01), Suda et al.

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