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Multifunction occupancy sensor

  • US 5,764,146 A
  • Filed: 10/25/1996
  • Issued: 06/09/1998
  • Est. Priority Date: 03/29/1995
  • Status: Expired due to Term
First Claim
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1. A multifunction passive infrared occupancy sensor which functions as an occupancy sensor for security systems and also as an occupancy sensor for energy management control systems comprising:

  • a. a segmented infrared lens array means, wherein the segments of the infrared lens array means establish different optical lobes in the field of view of the occupancy sensor;

    b. a pyroelectric infrared detector means, positioned at or near the focal point of the segmented infrared lens array means, for detecting movement of infrared sources within the field of view of the occupancy sensor and producing an output signal representative thereof;

    c. a processor comprising a first processing means for analyzing the output signal of the detector for security detection purposes by detecting changes in the output signal greater than a given security threshold, and a second processing means for analyzing the output signal of the detector for energy management purposes by detecting changes in the output signal greater than a given energy management threshold, wherein the energy management threshold of the second processing means is less than the security threshold of the first processing means.

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