Optical flame and explosion detection system and method
Patent 4220857 Issued on September 2, 1980. Estimated Expiration Date: 
November 1, 1998. 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.
November 1, 1998. 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 3742474 3825754 Dual spectrum infrared fire detector Flame sensing system Patent #: 4160163 InventorAssigneeApplicationNo. 05/956641 filed on 11/01/1978US Classes:250/339.15, Sensing flame or explosion250/340MethodsExaminersPrimary: Smith, Alfred E.Assistant: Howell, Daniel W. Attorney, Agent or FirmInternational ClassesG01J 5/60 (20060101)G08B 17/12 (20060101) F23N 5/08 (20060101) AbstractOptical flame and explosion detection system having first and second channels with each of the channels being responsive to different combustion products and detecting radiation from the combustion products and converting the radiation into electrical signals. A filter is provided in each of the channels to limit the spectral response to a narrow band. The levels of the radiation are ascertained by level detectors which provide first and second signals when predetermined signal levels are reached in the first and second channels. A ratio of the two electrical signals from the first and second channels is ascertained. When a predetermined level is reached from the ratio of the electrical signals and also for the individual signals, an output signal is produced which can be utilized in actuating alarms and other devices.Other References
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