Optical sensor and reflector to reflect a different wavelength

Details Optical sensor and reflector to reflect a different wavelength Optical sensor and reflector to reflect a different wavelength

1983-03-29

1986-01-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, 2504611, G01V 904, G08B 1318

Patent

active

045635773

ABSTRACT:
An optical sensor is disclosed comprising a transmitter which transmits a light beam, a receiver 2 for receiving reflected light and a reflector for directing light from the transmitter to the receiver. The reflector converts the wavelength of the light transmitted by the transmitter and the receiver is tuned to detect light of the converted wavelength. Objects located in the area between the reflector and the combination transmitter/receiver are detected as they do not convert the wavelength of the light from the transmitter even if they reflect light to the receiver.

REFERENCES:
patent: 3839639 (1974-10-01), Hughes
patent: 4220412 (1980-09-01), Shroyer et al.
patent: 4224608 (1980-09-01), Lederer
patent: 4271358 (1981-06-01), Schwarz
patent: 4403143 (1983-09-01), Walker et al.

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