Sensor device and method for capacitive approximation detection
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United States of America Patent
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Aug 15, 2017
Grant Date -
Dec 11, 2014
app pub date -
Jan 3, 2012
filing date -
Jan 4, 2011
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Abstract
A capacitive sensor device with an electrode system has a first transmitting electrode and a first reception electrode, wherein the first transmitting electrode can be brought into capacitive coupling with the first reception electrode, and a second transmitting electrode and a second reception electrode, wherein the second transmitting electrode can be brought into capacitive coupling with the second reception electrode, a signal generator for feeding the first transmitting electrode with a first electric alternating signal and the second transmitting electrode with a second electric alternating signal, and a signal processing device, which is coupled with the first reception electrode and with the second reception electrode, and which is adapted to form a first measurement variable from the difference between a first electric value tapped at the first reception electrode and a second electric value tapped at the second reception electrode.
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