Liquid gauge having an optical fiber with flexible membrane encl

Details Liquid gauge having an optical fiber with flexible membrane encl Liquid gauge having an optical fiber with flexible membrane encl

1990-02-23

1991-12-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250904, G01N 2185

Patent

active

050774824

ABSTRACT:
A fiber optic fuel or liquid level gauge is disclosed which determines the liquid level by measuring the amount of light loss due to evanescent transfer to the fuel or liquid. An optical fiber is supported in the fuel or liquid tank, with a first end adjacent the highest possible liquid level to be measured with a reflector at the first end. The optical fiber extends downwardly through the tank, and its second end is connected to a light source for injecting light into the fiber. The intensity of the input light is compared to the intensity of light reflected from the first fiber end, and the liquid level is calculated from the light loss. The gauge has very high reliability since it has no moving mechanical parts.

REFERENCES:
patent: 4287427 (1981-09-01), Scifres
patent: 4644177 (1987-02-01), Barabino
patent: 4745293 (1988-05-01), Christensen

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