Sensor device, steering angle sensor device, and method for determining the position of a metal object
US9625280B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2014 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Apr 5, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/202
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor device for determining the position of a metal body comprising at least one Eddy current sensor, which has a coil for generating a high-frequency electromagnetic alternating field and a device for operating the coil and for detecting an impedance of the coil, and comprising an analyzing device, which determines the position of the metal body relative to the coil using the detected impedance. A reference Eddy current sensor is provided which has a reference coil for generating a high-frequency electromagnetic alternating field and a reference device for operating the reference coil and for detecting an impedance of the reference coil and which is oriented/designed such that the electromagnetic alternating field of the reference Eddy current sensor is free of metal bodies, wherein the analyzing device is designed to form a beat from the detected impedance and to determine the position of the metal body dependent on the beat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.