Optical liquid level detector using dual varying light emitters

Details Optical liquid level detector using dual varying light emitters Optical liquid level detector using dual varying light emitters

1992-11-06

1993-12-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01N 1506

Patent

active

052742458

ABSTRACT:
A device for detecting a specific liquid level, that can be mounted externally on a transparent or translucent vessel wall, and is insensitive to ambient light. This device utilizes a single light detector and a pair of AC activated light sources. The light sources produce reflected light signals which, when balanced at the detector, cancel. When liquid is absent the light signals are balanced, and no signal is detected. When liquid is present the extra signal reflected by the meniscus causes the light signals to become unbalanced, and a signal is detected.

REFERENCES:
patent: 4701613 (1987-10-01), Watanabe et al.
patent: 4733095 (1988-03-01), Kurahashi et al.

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