Method and apparatus for detecting flame
May 5, 2009. 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 3689773 3902841 Flame detector Flame monitoring system Combustion monitoring and control system Flame monitoring apparatus Flame monitoring apparatus and method Dual detector flame sensor Infra-red flame detector Optical fire detection system responsive to spectral content and flicker frequency InventorsAssigneeApplicationNo. 348685 filed on 05/05/1989US Classes:250/554, Flame light source340/578By radiant energyExaminersPrimary: Willis, Davis L.Assistant: Messinger, Michael Attorney, Agent or FirmInternational ClassG08D 017/12AbstractA method of detecting flame within a region where flame is expected. Radiation emissions from the region are measured within selected portions of the visible and infra-red frequency bands. Spectral characteristics of the two measurements, including their auto spectra, coherency and transfer function, are derived. The derived spectral characteristics are compared with prestored spectral signatures representative of the spectral characteristics of radiation emitted from the region within the selected portions of the visible and infra-red frequency bands while known flame conditions prevail within the region--thereby estimating the deviation of the derived spectral characteristics from the prestored spectral signatures. The deviations aforesaid are compared with predetermined threshold alarm values to assess the presence or absence of flame. | |
