Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-01-18
2005-01-18
Glick, Edward J. (Department: 2882)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S342000, C250S353000, C340S565000
Reexamination Certificate
active
06844538
ABSTRACT:
A radiation detection apparatus is capable of detecting and locating events, such as a fire or the appearance of an intruder, in a scene under surveillance. The apparatus comprises an array of detector elements, e.g. infrared detectors. The apparatus has two fields of view, namely a first field of view defined by a lens providing a single focussed image of a distant scene on the array and a second field of view defined by a reflector arranged between a plane of the array and a plane of the lens whereby to reflect onto the detector array radiation entering the lens from outside the first field of view. One or more processors are provided to distinguish events in the second field of view from those in the first field of view.
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European Patent Search Report for GB 9909595.2, Jul. 13, 1999, 2 pages.
Hollock Stephen
Porter Stephen George
Wilson Bryan Lorrain Humphreys
Glick Edward J.
Infrared Integrated Systems Limited
Moser, Patterson & Sheridan L.L.P.
Thomas Courtney
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