Photo-electric digital circuit for monitoring strip loop positio

Details Photo-electric digital circuit for monitoring strip loop positio Photo-electric digital circuit for monitoring strip loop positio

1980-02-25

1981-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

226 42, G01N 2186

Patent

active

042975867

ABSTRACT:
Apparatus for monitoring strip loop position, having a plurality of light sources and a corresponding plurality of photo-detectors spaced from each other in the strip loop reservoir on opposite sides of the strip loop path; each photo-detector is connected to the input of a corresponding photocell amplifier which is normally biased to be driven to positive or negative saturation as a function of the input voltage applied to the photocell amplifier. The outputs of all the photocell amplifiers are coupled together through a summing junction to the input of an output amplifier for amplifying the voltage and current signals appearing at the summing junction. Display and/or control means are coupled to the output of the output amplifier.

REFERENCES:
patent: 2907565 (1959-10-01), Sauter
patent: 3177749 (1965-04-01), Best et al.
patent: 3240411 (1966-03-01), Zarleng

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