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US 4,509,041 AGranted
Correlation type flicker flamon
AssigneeThe Babcock & Wilcox Company
InventorsMarion A. Keyes, William L. Thompson
Life of this patent
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AssigneeThe Babcock & Wilcox Company
InventorsMarion A. Keyes, William L. Thompson
Estimating the term…
A device and method is disclosed which determines the presence and absence of a burner flame by injecting a pressure modulated signal into the burner which modulates a flame at a selected frequency. Light emitted from the flame is modulated at the same frequency. An optical sensor is provided for sensing the light amplitude modulation frequency and connected to a correlator circuit for correlating the light amplitude modulation signal with the pressure modulation signal. If the signals correlate, a flame is assumed to be present and a flame on signal generated. The pressure modulation signal can be discontinued periodically. If a corresponding discontinuation of the light amplitude modulation signal is sensed this is indicative of the continued presence of the flame whereas a continuation of the light amplitude modulation signal indicates a flame out condition.
A device for continuously determining the presence of a flame emitted from a burner comprising:
A method of continuously determining the presence of a flame emitted from a burner comprising:
Dependencies are inferred from the claim text.