Liquid level indicator

Details Liquid level indicator Liquid level indicator

1981-02-20

1982-10-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01N 1506

Patent

active

043552382

ABSTRACT:
The liquid level indicator contains a number of first light fibers, a number of second light fibers, optical lens means interposed between each output end of the first fibers and an associated input end of the second fibers, and light detectors associated with the output ends of the second fibers. The optical lens means has substantially the same index of refraction as the liquid. When the lens means is not immersed into the liquid, it focusses light from the first fiber to the second fiber. This focussing effect is eliminated when the lens is submerged into the liquid.

REFERENCES:
K. A. James et al., "Fiber Optics: The Way to True Digital Sensors?", Control Engineering, Feb. 1979, pp. 30-33.

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