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Capacitive distance sensor

  • US 6,320,394 B1
  • Filed: 02/05/1998
  • Issued: 11/20/2001
  • Est. Priority Date: 02/14/1996
  • Status: Expired due to Term
First Claim
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1. A capacitive presence sensor comprising:

  • a first plate positioned for facing an object for determining a distance to be measured therebetween and forming a feedback capacitive element;

    a second plate positioned for facing the object, the second plate and first plate being the feedback capacitive element;

    an amplifier having an input and an output, wherein said feedback capacitive element is connected between said input and said output of said amplifier, and a negative feedback branch from the output to the input of the amplifier that includes the feedback capacitive element, the amplifier providing a voltage step output in response to a voltage step input, the output having an amplitude indicative of the presence of the object adjacent the plates.

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