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Material-discerning proximity sensing

  • US 9,201,548 B2
  • Filed: 06/26/2012
  • Issued: 12/01/2015
  • Est. Priority Date: 05/03/2012
  • Status: Active Grant
First Claim
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1. A material-discerning proximity sensing device, comprising:

  • an antenna that is arranged to radiate a radio-frequency signal;

    a capacitive sensor that is arranged to detect a change in capacitance of the capacitive sensor and that is arranged to receive the radio-frequency signal; and

    an electrical quantity sensor that is arranged to detect a change of the received radio-frequency signal;

    wherein the electrical quantity sensor comprises an analog to digital converter arranged to quantify the detected change of the received radio-frequency signal using a sampling rate that is less-than-or-equal-to twice the frequency of a carrier wave of the radio-frequency signal.

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