Detection of a distance variation with respect to a rotation axis
First Claim
1. A method of detection of a distance variation between an object rotating around an axis and a terminal fixed in position with respect to the axis and capable of emitting a radio-frequency field for at least one resonant circuit attached to the object, comprising:
- measuring and recording, on the terminal side, a maximum value of a quantity representative of the coupling between an oscillating circuit of the terminal and said at least one resonant circuit; and
detecting a variation, over multiple rotations of the rotating object, of the maximum value, wherein the detected variation in the maximum value is representative of a distance variation over time with respect to the axis.
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Accused Products
Abstract
A method of detection of a distance variation with respect to an axis of at least one point of an object rotating around this axis by a terminal at a fixed position with respect to the axis and capable of emitting a radiofrequency field for at least one resonant circuit attached to the object. The method includes the steps of measuring and recording, on the terminal side, a maximum value of a quantity representative of the coupling between an oscillating circuit of the terminal and the at least one resonant circuit; and detecting a variation of this periodic maximum.
7 Citations
31 Claims
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1. A method of detection of a distance variation between an object rotating around an axis and a terminal fixed in position with respect to the axis and capable of emitting a radio-frequency field for at least one resonant circuit attached to the object, comprising:
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measuring and recording, on the terminal side, a maximum value of a quantity representative of the coupling between an oscillating circuit of the terminal and said at least one resonant circuit; and detecting a variation, over multiple rotations of the rotating object, of the maximum value, wherein the detected variation in the maximum value is representative of a distance variation over time with respect to the axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting a distance variation between an object rotating about an axis of rotation and a terminal fixed in position with respect to the axis of rotation, comprising:
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transmitting, by the terminal, a radio frequency field toward the rotating object; and measuring, by the terminal, a variation, over multiple rotations of the rotating object, of a maximum coupling between an oscillating circuit of the terminal and a resonant circuit affixed to the rotating object, wherein the variation of the maximum coupling is indicative of a distance variation over time between the rotating object and the axis. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system to detect a distance variation between an object rotating about an axis of rotation and the axis of rotation, comprising:
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a terminal mounted in a fixed position with respect to the axis of rotation, the terminal including an oscillating circuit configured to transmit a radio frequency field toward the rotating object; and a resonant circuit affixed to the rotating object, wherein the terminal is configured to measure a variation, over multiple rotations of the rotating object, of a maximum coupling between the oscillating circuit and the resonant circuit and wherein the variation of the maximum coupling is indicative of the distance variation over time between the rotating object and the axis. - View Dependent Claims (27, 28, 29, 30, 31)
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Specification