Residual fluid detection apparatus for detecting fluid at the bo

Details Residual fluid detection apparatus for detecting fluid at the bo Residual fluid detection apparatus for detecting fluid at the bo

1991-08-19

1993-06-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, G01N 2190

Patent

active

052162397

ABSTRACT:
A light source irradiates the bottom of a bottle with light that contains visible light rays and infrared rays. Two photoelectric conversion sensors remove the light passing through the bottle bottom from the light source. An optical filter which passes only infrared rays placed in front of the light receiving surface of one of the photoelectric conversion sensors, and the outputs from the two photoelectric conversion sensors are compared directly and a signal is provided when a difference between the outputs exceeds a predetermined value.

REFERENCES:
patent: 4221961 (1980-09-01), Payton
patent: 4368980 (1983-01-01), Aldred et al.
patent: 4551627 (1985-11-01), Reich
patent: 4682023 (1987-07-01), Yoshida
patent: 4943713 (1990-07-01), Yoshida

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