Passive infrared detectors

Details Passive infrared detectors Passive infrared detectors

2011-01-25

2011-01-25

Porta, David P (Department: 2884)

Radiant energy

Infrared-to-visible imaging

Including detector array

C250S353000

Reexamination Certificate

active

07875852

ABSTRACT:
A passive infrared detector assembly including a detector housing comprising a window transparent to far infrared radiation, at least one sensor sensitive to the far infrared radiation and disposed within the detector housing and an anti-masking subassembly, including at least one light guide having a serrated light aperture, the light aperture defining a plurality of teeth like portions and a plurality of grooves and being disposed close to the outside of the window, at least one infrared light emitter operative to emit near infrared radiation via the light aperture of the at least one light guide and a near infrared radiation receiver operative to receive radiation emitted by the at least one near infrared light emitter and to measure the level of received near infrared radiation and to provide a masking alarm signal upon detection of a predetermined change in the level of the received near infrared radiation.

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An Examination Report dated Sep. 6, 2010, which issued during the prosecution of Applicant's UK Patent Application No. 1010004.8.
An Office Action dated Sep. 2, 2010, which issued during the prosecution of Applicant's U.S. Appl. No. 12/374,084.

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