Sensor device for capacitively ascertaining distance
US8659407B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2008 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Mar 21, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor unit, in particular a sensor unit in or on a vehicle, for capacitively ascertaining the distance between the sensor device and an object, having an electrode for forming a capacitive system with the object and an apparatus for creating a signal proportional to the capacitance of the capacitive system. The sensor unit has a reference electrode for forming a capacitive reference system with the object, an additional apparatus for creating a reference signal proportional to the capacitance of the capacitive reference system, and an analyzer device for ascertaining the distance by forming a ratio of the signal and the reference signal, the reference electrodes having an electrode shape, which is different from the electrode shape of the electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.