Dual channel multi-spectrum infrared optical fire and explosion detection system
Patent 5612676 Issued on March 18, 1997. Estimated Expiration Date: 
March 18, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 18, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3665440 3825754 3859520 Dual spectrum infrared fire detector Discriminating fire sensor Fire and explosion detection apparatus Two channel optical flame detector Flame detector Dual spectrum infrared fire sensor Fire and explosion detection InventorsAssigneeApplicationNo. 153801 filed on 11/16/1993US Classes:340/578, By radiant energy250/339.15Sensing flame or explosionExaminersPrimary: Williams, HezronAssistant: Oda, Christine K. Attorney, Agent or FirmForeign Patent References
International ClassG08B 017/12AbstractA fire detection system including two optical sensing channels and signal processing circuitry that processes the two sensing channels' output signals and generates another output signal when the processed signals are indicative of a fire. The system automatically detects hydrocarbon and certain non-hydrocarbon fueled fires. The first sensing channel simultaneously senses IR radiation in two IR spectral regions having separate and distinct bandwidths and generates a first signal corresponding to incident IR radiation being sensed in at least one of these spectral regions. One bandwidth is selected so the first sensing channel is responsive to the IR radiation emitted by hydrocarbon and/or certain non-hydrocarbon fueled fires and the other bandwidth is selected so the first sensing channel is responsive to IR radiation emitted from hydrocarbon fueled fires. Both bandwidths are selected so the first sensing channel is essentially non-responsive to solar IR radiation. The second sensing channel simultaneously senses IR radiation in three IR spectral regions, defined by separate and distinct bandwidths, and generates a second signal corresponding to the incident IR radiation being sensed in at least one of the these spectral regions. Each second channel spectral region bandwidth is selected so the second sensing channel is responsive to IR radiation emitted by non-fire radiation sources but non-responsive to IR radiation in the first channel spectral regions.Other References
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