Correlation type flicker flamon

Details Correlation type flicker flamon Correlation type flicker flamon

G - Physics

01

J

354/29, 340/155.

G01J 1/44 (2006.01) F23N 5/08 (2006.01) G08B 17/12 (2006.01)

Patent

CA 1202703

CORRELATION TYPE FLICKER FLAMON ABSTRACT OF THE DISCLOSURE A device and method is disclosed which determines the presence and absence of a burner flame by injecting a pressure moduluted 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 modula- tion 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. - 12 -

424108

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