Flame monitoring apparatus and method having a second signal processing means for detecting a frequency higher in range than the previously detected frequencies
Patent 5191220 Issued on March 2, 1993. Estimated Expiration Date: 
August 28, 2011. 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.
August 28, 2011. 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 ReferencesFlame monitoring apparatus Flame monitoring system Burner flame sensing system and method Patent #: 5077550 InventorAssigneeApplicationNo. 751180 filed on 08/28/1991US Classes:250/554, Flame light source340/578By radiant energyExaminersPrimary: Nelms, David C.Assistant: Davenport, T. Attorney, Agent or FirmForeign Patent References
International ClassG01J 031/14Foreign Application Priority Data1990-09-06 GBAbstractThe presence of a burner flame, in a multiple burner installation, is monitored by sensing a signal indicative of the spectrum of the fluctuating component in the radiation of the flame over a range of frequencies. In the lower frequency range a measure is obtained of the difference of signal strength at two predetermined frequency levels. The signal strength is also measured at a higher frequency. At the higher frequency there is a significant difference in signal intensity between the flame-on and flame-off conditions, while the change of signal strength between the spectra of flame-on and flame-off conditions in the lower frequency range is sensitive to frequency. By processing the two measures together they can augment each other and produce an enhanced change of signal between flame-on and flame-off conditions, making detection easier.Other References
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