Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-08-15
1993-06-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250904, G01N 2149
Patent
active
052201805
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
Brownrigg Patrick C.
Chang David B.
Vali Victor
Denson-Low W. K.
Hughes Aircraft Company
Le Que T.
Leitereg E. E.
Nelms David C.
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