Patent ID: 6013919
Filing Date: 2000-01-11
Classification: F23N

Abstract:
A flame detection circuit for detecting the presence of a flame in a gas turbine engine, comprising:a photodiode responsive to electromagnetic radiation from said flame, said photodiode generating a photocurrent proportional to an intensity of a predetermined portion of said electromagnetic radiation;a current to voltage converter connected to said photodiode, said current to voltage converter converting said photocurrent to a voltage, said current to voltage converter being provided with a feedback loop for providing gain thereto;a voltage to current converter connected to an output of said current to voltage converter, said voltage to current converter including a current regulator for maintaining an output of said voltage to current converter proportional to the voltage output by said current to voltage converter; anda resistive biasing network for setting a zero bias current of said circuit, wherein an output of said flame detection circuit is indicative of the presence of a flame.