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Device and method for capacitive measurement by a floating bridge

  • US 8,149,002 B2
  • Filed: 11/22/2006
  • Issued: 04/03/2012
  • Est. Priority Date: 11/24/2005
  • Status: Active Grant
First Claim
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1. A device for capacitive measurement by a floating bridge, comprising:

  • a sensor module comprising at least one measuring electrode and at least one guard electrode arranged close to a target connected to a general earth,a guard to which said guard electrode is connected,at least one integrated circuit for capacitive measurement, and comprising (i) a measurement input and (ii) an excitation output for measuring capacitances between electrodes connected respectively to said measurement input and to an excitation signal generated on said excitation output, (iii) an earth terminal and (iv) a measurement output,means for supplying said integrated circuit for capacitive measurement in floating mode, andwherein said measurement input is connected to said measuring electrode, said guard is connected to the reference earth terminal of said integrated circuit, and said excitation output is connected to said general earth.

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