Detector for tubular transparent article

Details Detector for tubular transparent article Detector for tubular transparent article

1974-07-29

1976-01-13

Lawrence, James W.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250216, 250222, 250223B, 356201, 356209, 356246, G01n 2124, G01n 110

Patent

active

039327639

ABSTRACT:
A detector for tubular transparent articles employs a light beam directed across an opening in a housing, along a path offset from a diameter of that opening. When a tubular article is present in the opening, the light is glazingly deflected by a curved surface of the article, optimally at the critical angle of maximum light reflection. The resultant reduction in beam intensity is sensed by a photodetector to indicate the presence of the article.

REFERENCES:
patent: 2024720 (1935-12-01), Cornell et al.
patent: 3265901 (1966-08-01), Schneider
patent: 3544225 (1970-12-01), Wattenburg et al.
patent: 3787703 (1974-01-01), Topol

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