Obstruction position detecting system with comparison and memory

Details Obstruction position detecting system with comparison and memory Obstruction position detecting system with comparison and memory

1992-09-15

1993-09-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250221, 340556, G01V 904

Patent

active

052431835

ABSTRACT:
The present invention employs a plurality of spaced light beam sources and corresponding photodetectors to form a light screen. A programmed microprocessor and memory circuitry senses the photodetector output and stores information on the position of an allowed obstruction. During operation of the equipment, the microprocessor repeatedly senses the photodetector output to determine which channels are blocked. When dangerous changes occur in the size, position or presence of an obstruction, the system alerts the operator or stops the equipment.

REFERENCES:
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 4249074 (1981-02-01), Zettler et al.
patent: 4566337 (1986-01-01), Smart

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