Optical sensor arrangement for presence detection with variable

Details Optical sensor arrangement for presence detection with variable Optical sensor arrangement for presence detection with variable

1994-01-10

1995-05-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 340556, G01V 904

Patent

active

054163161

ABSTRACT:
The invention relates to a method of operating an optical sensor arrangement for detecting articles present in a monitored region by means of a light transmitter and a light receiver. The light transmitter emits light signals which respectively comprise a number of pulses which follow each other at a determined pulse repetition frequency.

REFERENCES:
patent: 4381446 (1983-04-01), Fukuyama et al.
patent: 4434363 (1984-02-01), Yorifuji et al.
patent: 4973837 (1990-11-01), Bradbeer
patent: 5164714 (1992-11-01), Wehrer

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