Infrared-based sensing circuit providing an output simulating th

Details Infrared-based sensing circuit providing an output simulating th Infrared-based sensing circuit providing an output simulating th

1992-10-06

1993-07-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

250214R, 307261, G01J 3114

Patent

active

052276392

ABSTRACT:
A converter circuit provides an output signal of polarity opposite that of an input signal having a DC component and a low frequency periodic component in response to presence of that input signal. Current is transferred from a first capacitor to a second to accomplish this conversion. The circuit has particular application in a flame sensing interface circuit using a sensor of the infrared radiation generated by the flame to change the impedance of the sensor. By use of the circuit, the output of an infrared sensing amplifier imitates the output of a conventional flame rod sensor, and provides an output signal compatible with the output of a flame rod to the input to a flame signal processor.

REFERENCES:
patent: 3710149 (1973-01-01), Thomson
patent: 3755799 (1973-08-01), Riccardi
patent: 3903418 (1975-09-01), Horn
patent: 4328527 (1982-05-01), Landis
patent: 4616138 (1986-10-01), Yuchi
patent: 4847620 (1989-07-01), Trafimenkoff et al.
patent: 4904986 (1990-02-01), Pinckaers
patent: 5073769 (1991-12-01), Kompelien

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