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PIR motion sensor

  • US 7,579,595 B2
  • Filed: 09/11/2007
  • Issued: 08/25/2009
  • Est. Priority Date: 09/11/2006
  • Status: Active Grant
First Claim
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1. A PIR motion sensor comprising:

  • at least a first array of pyroelectric elements;

    at least a second array of pyroelectric elements; and

    at least one processor receiving respective first and second signals representative of the outputs of the first and second arrays, the processor adding the first and second signals together to establish a sum signal and subtracting the first signal from the second signal to establish a difference signal, the processor determining, for each of the sum signal and the difference signal, whether detection should be indicated, wherein the sensor is mounted on a ceiling, wherein each array includes at least four elements, two with positive polarity and two with negative polarity, wherein each element in the first array is azimuthally straddled by elements of the second array.

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