Optical fire detection system responsive to spectral content and flicker frequency
Patent 4533834 Issued on August 6, 1985. Estimated Expiration Date: 
December 2, 2002. 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.
December 2, 2002. 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 3100264 3374950 3742474 3829218 3885879 Flame monitoring apparatus Flame detector Optical fire-detector Spectrometer employing optical fiber time delays for frequency resolution Smoke detector InventorAssigneeApplicationNo. 06/446143 filed on 12/02/1982US Classes:250/554, Flame light source250/227.11, Light conductor250/339.05, With additional noninfrared wavelengths250/339.15, Sensing flame or explosion250/340, Methods340/578By radiant energyExaminersPrimary: Nelms, David C.Assistant: Gatto, J. Attorney, Agent or FirmInternational ClassesF23N 5/08 (20060101)G08B 26/00 (20060101) G08B 17/12 (20060101) AbstractA fire detection system using optical fibers to transmit flame signals from a plurality of remote monitoring stations to a central detection and analysis station, the invention comprises a network of optical fibers which connect the monitoring stations to the central detection station for the purpose of transmitting incident analog optical, infrared and ultraviolet spectra to the central station for detection of fire conditions. The central detection and analysis station preferably includes a rotary scanner which scans each of the optical fibers, light from the fibers being dispersed by a prism associated with the scanner to allow detection of the various spectral components of the dispersed light by light sensitive semiconductors. The detected spectral components are then compared to known fire signal signatures which include flicker rate and spectral content information.Other References
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