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US 4,422,041 AGranted
Magnet position sensing system
AssigneeThe United States of America as represented by the Secretary of the Army
InventorJeffrey A. Lienau
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Abstract
Magnetic position sensing for an object is disclosed wherein the analogue the distance between an object and a sensor is detected for indicating changes in object position in one, two, or three dimensions. An accurate, and continous output signal indicative of object position and incremental changes in that position are obtained. Additionally, magnetic sensing provides motion sensing of a support structure or velocity and acceleration sensing of an object.
Claims4
A magnetic position sensing circuit comprising:
- an object having a longitudinal axis and adapted for displacement substantially along said axis;
- magnetic means disposed selectively on said object for producing a plurality of magnetic fields, said magnetic means being a plurality of spaced apart magnetic field producing members disposed around the circumference of the object for radiating individual magnetic fields circumferentially outward from the object;
- sensing means disposed adjacent to said object for sensing magnetic field strength indicative of lateral and longitudinal position changes of said magnetic means relative to said sensing means, said sensing means being a plurality of sensor elements disposed in a plurality of parallel planes passing through the object and each element being disposed for sensing positional changes in the object;
- signal processing means for indicating the changes in lateral and longitudinal position between said sensing means and said magnetic means;
- and a centerline axis normal to said planes, said sensor elements being equidistant from said centerline.
2 more elements
Dependencies are inferred from the claim text.