Processing circuit for optical combustion monitor

Details Processing circuit for optical combustion monitor Processing circuit for optical combustion monitor

1990-05-30

1991-11-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330279, 330282, H01J 4014

Patent

active

050632876

ABSTRACT:
A processing circuit is provided for use in an optical combustion monitor for an internal combustion engine. The circuit includes a variable gain amplifier for amplifying a signal from one or more opto-electric transducers sensitive to combustion light in the engine cylinders. A gain control circuit including a peak detector controls the variable gain amplifier so that the peak amplitude of the amplifier output signal is substantially constant.

REFERENCES:
patent: 3708678 (1973-01-01), Kreda
patent: 3743837 (1973-07-01), Pooley et al.
patent: 3978720 (1976-09-01), Ford
patent: 4312043 (1982-01-01), Frank et al.
patent: 4381748 (1983-05-01), Eckert et al.
patent: 4459475 (1984-07-01), Flint et al.
patent: 4870369 (1989-09-01), Bartenstein et al.
patent: 4947133 (1990-08-01), Thomas

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