Magnetic position sensing techniques
First Claim
1. A method of sensing the position of a first element with respect to a second element, the first element being movable with respect to the second, which comprises:
- (a) fixing a first magnetic marker comprising a low coercivity, high permeability material to said first element;
(b) fixing a second magnetic marker comprising a low coercivity, high permeability material to said second element;
(c) fixing a third magnetic marker comprising a low coercivity, high permeability material to a position on said second element remote from said second magnetic marker, such that the locus of motion of said first element is between said second and third magnetic markers; and
(d) sensing the positions of the two elements by a remote magnetic sensing technique.
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Abstract
A method of sensing the position of a first element with respect to a second element is disclosed, the first element being movable with respect to the second. The method comprises: (a) fixing a first magnetic marker to said first element; (b) fixing a second magnetic marker to said second element; (c) sensing the positions of the two markers by a remote magnetic sensing technique. Optionally, a third magnetic marker may be used, the second and third markers then preferably being located at the extremes of travel of said first element. The method may be used to determine linear or angular relationships.
24 Citations
9 Claims
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1. A method of sensing the position of a first element with respect to a second element, the first element being movable with respect to the second, which comprises:
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(a) fixing a first magnetic marker comprising a low coercivity, high permeability material to said first element;
(b) fixing a second magnetic marker comprising a low coercivity, high permeability material to said second element;
(c) fixing a third magnetic marker comprising a low coercivity, high permeability material to a position on said second element remote from said second magnetic marker, such that the locus of motion of said first element is between said second and third magnetic markers; and
(d) sensing the positions of the two elements by a remote magnetic sensing technique. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification