Apparatus and method for capacitively recording measured values without errors

An apparatus and a method for capacitively detecting an object, which is preferably arranged behind a flat article that is transmissive to electromagnetic radiation or behind a wall, has a sensor (5.1) with sensor electrodes for detecting the object, preferably for detecting relative movements betwe...

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Bibliographic Details
Main Author GERD REIME
Format Patent
LanguageChinese
English
Published 17.10.2012
Subjects
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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Summary:An apparatus and a method for capacitively detecting an object, which is preferably arranged behind a flat article that is transmissive to electromagnetic radiation or behind a wall, has a sensor (5.1) with sensor electrodes for detecting the object, preferably for detecting relative movements between the sensor and the flat article or finger. A control circuit is used to drive the sensor electrodes and to evaluate the output signals from the sensor. A capacitive sensor which does not react to tilting or to small distance changes with respect to the surface is provided as a result of the fact that the sensor has at least one sensor electrode (5.2) which is surrounded by at least one further electrode (5.3), wherein the surrounding further electrode (5.3) is connected to the sensor electrode via the control circuit in such a manner that, if the potential of the sensor electrode changes, the potential of the surrounding further electrode is controlled in the opposite way to that of the sensor electrode such tha
Bibliography:Application Number: CN201080048964