Patent ID: 6064064
Filing Date: 2000-05-16
Classification: G08B

Abstract:
A fire detector comprising:a wide band infrared sensor;means for detecting when a level of wide band infrared radiant energy detected by the wide band infrared sensor exceeds an energy level threshold; andmeans responsive to said detecting means for initiating a fire response protocol;wherein said means for detecting when a level of wide band infrared radiant energy detected by the wide band infrared sensor exceeds an energy level threshold comprises a filter connected to the wide band infrared sensor for measuring the level of wide band infrared radiant energy, and a comparator connected to an output of said filter and to said energy level threshold; andwherein said means for detecting when a level of wide band infrared radiant energy detected by the wide band infrared sensor exceeds an energy level threshold further comprises a visible band sensor connected to a second filter for measuring a level of visible band radiant energy, and a subtractor whereby said level of visible band radiant energy is subtracted from the output of the filter connected to the wide band infrared sensor prior to said comparator.