Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-10-03
2006-10-03
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S228000
Reexamination Certificate
active
07116097
ABSTRACT:
In accordance with one embodiment of the invention, a method and system for detecting the position of a shaft comprises providing a shaft with defined hardened metallic regions. The shaft has a first hardened metallic region from a surface of the shaft to a first radial depth from the surface at a first longitudinal position. The shaft has a second hardened metallic region from the surface of the shaft to a second radial depth at a second longitudinal position. The second radial depth is different from the first radial depth. A sensor senses an eddy current to detect an alignment of at least one of the first hardened metallic region and the second hardened metallic region with a fixed sensing region at a respective time. A data processor determines a longitudinal position of the shaft with respect to a cylinder at the respective time based on the sensed eddy current.
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Gray Keith Wayland
Killen Dale H.
Revankar Gopal Subray
Aurora Reena
Deere & Company
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