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Apparatus and method for detecting tampering with an infra-red motion sensor

  • US 9,123,222 B2
  • Filed: 08/08/2012
  • Issued: 09/01/2015
  • Est. Priority Date: 03/15/2012
  • Status: Expired due to Fees
First Claim
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1. An infra-red motion detector Fresnel lenslet body comprising:

  • an array of Fresnel lenslets provided on said Fresnel lenslet body, each of said Fresnel lenslets corresponding to a motion detection zone for collecting and focusing light onto a passive infrared sensor target, said array of Fresnel lenslets being provided on a first side of said body to act as internal side Fresnel lenslets; and

    at least one anti-masking optical structure provided on said Fresnel lenslet body within said array of Fresnel lenslets, said at least one anti-masking optical structure having an optical property that changes in the presence of a masking material, said at least one anti-masking optical structure is provided on a second side of said body to act as at least one external side anti-masking optical structure.

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