Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-03-22
1985-04-02
Kreitman, Stephen A.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1712, G08B 2100
Patent
active
045090416
ABSTRACT:
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.
REFERENCES:
patent: 3146822 (1964-09-01), Ray
patent: 3586468 (1971-06-01), Sims et al.
patent: 3651327 (1972-03-01), Thomson
patent: 3772670 (1973-11-01), Swithenbank et al.
patent: 3988104 (1976-10-01), Barber
patent: 4157506 (1979-06-01), Spencer
patent: 4280184 (1981-07-01), Weiner et al.
"CD4049UB, C94050B Types COS/MOS Hex Buffer/Converters Features", p. 194, (an undated description of a prior art Lex inverter).
CD4070B CD4077B Types COS/MOS Quad Exclusive-OR and Exclusive-NOR Gates Features", p. 235, (an undated description of a prior art RCA Exclusive or Gate).
Keyes Marion A.
Thompson William L.
Edwards Robert J.
Kreitman Stephen A.
Matas Vytas R.
Noland Thomas P.
The Babcock & Wilcox Company
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