Electromagnetic apparatus for measuring angular position
First Claim
1. An apparatus for measuring an angular position about a rotation axis, and related physical parameters, of a movable part, the apparatus comprising at least one electrodynamic target, the target having an angular position in a rotation plane that is representative of the angular position of the movable part;
- in proximity to the target, at least two resonators formed by plane slow-wave structures connected to at least one RF oscillator and a measuring circuit, further characterized in that;
the resonators being formed by coupled slow-wave structures, each having an angular width, and placed parallel to the rotation plane,internal ends of the coupled slow-wave structures being connected to one another, their external ends forming terminals connected to the measuring circuit,the electrodynamic target having a non-symmetrical configuration with respect to the rotation axis,the measuring circuit converting changes in the electrodynamic parameters of the resonators into at least two informative signals,the measuring circuit comparing the informative signals and converting their difference into an electrical output indicative of the angular position of the target.
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Accused Products
Abstract
An apparatus is disclosed for measuring the angular position of a movable part. The method and apparatus comprise at least two resonators formed by coupled slow-wave structures, e.g. coupled spirals, and a movable target. The angular position of the target is representative of the angular position of the movable part. A change in the angular position of the target causes a change in electrodynamic parameters of the resonators. The change in the electrodynamic parameters is converted to a reading of angular position of the target with respect to the resonators. An electromagnetic field is excited in the resonators at a frequency at which electromagnetic parameters of the resonators depend upon the position of the target.
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Citations
18 Claims
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1. An apparatus for measuring an angular position about a rotation axis, and related physical parameters, of a movable part, the apparatus comprising at least one electrodynamic target, the target having an angular position in a rotation plane that is representative of the angular position of the movable part;
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in proximity to the target, at least two resonators formed by plane slow-wave structures connected to at least one RF oscillator and a measuring circuit, further characterized in that; the resonators being formed by coupled slow-wave structures, each having an angular width, and placed parallel to the rotation plane, internal ends of the coupled slow-wave structures being connected to one another, their external ends forming terminals connected to the measuring circuit, the electrodynamic target having a non-symmetrical configuration with respect to the rotation axis, the measuring circuit converting changes in the electrodynamic parameters of the resonators into at least two informative signals, the measuring circuit comparing the informative signals and converting their difference into an electrical output indicative of the angular position of the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification