Radiation detection apparatus
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United States of America Patent
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Jan 18, 2005
Grant Date -
N/A
app pub date -
Apr 25, 2000
filing date -
Apr 26, 1999
priority date (Note) -
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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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