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Infrared occupancy sensor

  • US 7,541,924 B2
  • Filed: 02/06/2006
  • Issued: 06/02/2009
  • Est. Priority Date: 02/06/2006
  • Status: Active Grant
First Claim
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1. An occupancy sensor, comprising:

  • an infrared sensor;

    a variable bandpass filter operably coupled to the infrared sensor;

    a digital potentiometer adapted to control a ratio of center frequency of the bandpass filter to a bandwidth of the bandpass filter; and

    a controller operably coupled to the infrared sensor and the variable bandpass filter;

    wherein the controller is adapted to;

    filter the signals generated by the infrared sensor using the variable bandpass filter, andprocess the filtered signals to determine the presence or absence of an occupant within a defined region.

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