Light barrier with spectrally filtered reflection means

Details Light barrier with spectrally filtered reflection means Light barrier with spectrally filtered reflection means

1983-09-21

1985-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, 250226, G08B 1318, G06M 700

Patent

active

045462461

ABSTRACT:
A reflection light barrier for recognizing also strongly reflecting articles has at one side of a monitored region a light transmitter (13) which is combined with a light receiver (12) and, at the other end of the monitored region, a reflecting device (11). The reflecting device (11) has optical filter characteristics so that the spectral distribution of the light beam is changed on reflection. An electronic processing circuit only produces a signal following the incidence of reflected light on the receiver when the spectral distribution does not correspond with the spectral distribution of light reflected from the reflecting device.

REFERENCES:
patent: 3842257 (1974-10-01), Kohler
patent: 3862415 (1975-06-01), Harnden, Jr. et al.
patent: 3944818 (1976-03-01), Bechtel
patent: 4224608 (1980-09-01), Lederer

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