Patent ID: 7355501
Filing Date: 2008-04-08
Classification: F16C,G01D,G05G

Abstract:
1. A device for contact-less measurement of distances in multiple directions of an electrically conductive body, said device comprising at least one first inductive element placed essentially around the electrically conductive body; a plurality of second inductive elements or other magnetic field sensors provided in the vicinity of said first inductive element; a high-frequency generator for feeding a high-frequency current to said at least one first inductive element so as to generate a high-frequency magnetic field, said high-frequency current having a frequency high enough for a substantial part of said high-frequency magnetic field to not be able to enter said conductive body due to eddy currents being formed in said conductive body; and a signal processing arrangement for detecting output signals from said second inductive elements or other magnetic field sensors, said signal processing arrangement being adapted for detecting, in response to a movement of said conductive body in a first direction, a movement of said high-frequency magnetic field in a second direction opposite to said first direction in consequence of said eddy currents.