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Sensor and Method for Detecting an Object

  • US 20130249570A1
  • Filed: 03/19/2013
  • Published: 09/26/2013
  • Est. Priority Date: 03/20/2012
  • Status: Active Grant
First Claim
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1. A sensor for detecting an object, comprising:

  • a probe electrode (10) for forming a measuring capacitance (C1) with the object (5) to be detected,a charge generator (30) for generating an alternating charging voltage (U3), wherein the probe electrode (10) is charged by the alternating charging voltage (U3),an amplifier (A) for amplifying a voltage across the measuring capacitance (C1), wherein the amplifier (A) includes a first supply connection (A1) and a second supply connection (A2),a processing component (20) for processing signals that are outputted at an output of the amplifier (A) to form at least one output signal, andat least one sensor output (50) for outputting the at least one output signal, whereina second supply voltage (U2) in the form of a DC voltage is connected to the second supply connection (A2), anda first supply voltage (U1) having an AC voltage portion is connected to the first supply connection (A1), wherein a supply voltage generator (30) is available for generating the AC voltage portion.

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