Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-09-24
1993-08-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250575, 250577, 250905, 250900, H01J 516, G01N 1506
Patent
active
052351793
ABSTRACT:
An evanescent wave liquid level sensor for measuring the density-compensated level of a liquid in a container. The sensor employs an eccentric core optical fiber fully immersed in the liquid to be measured. Light is injected into one end of the fiber. Some of the light will be lost due to evanescent wave losses. Changes in the ratio of the intensity of the input light and the reflected light are due solely to changes in the density of the liquid. Changes in the liquid density can then be used to compensate a liquid level measurement. Since the liquid temperature is related to its density, the sensor can also be used to measure changes in the liquid temperature.
REFERENCES:
patent: 3995169 (1976-11-01), Oddon
patent: 4240747 (1980-12-01), Harmer
patent: 4287427 (1981-09-01), Scifres
patent: 4598742 (1986-07-01), Taylor
patent: 4893894 (1990-01-01), Caimi
patent: 5026984 (1991-06-01), Gerdt
patent: 5058420 (1991-10-01), Vali et al.
Chang David B.
Lawrence Albert F.
Pearson Keith V.
Vali Victor
Denson-Low W. K.
Gudmestad Terje
Hughes Aircraft Company
Leitereg Elizabeth E.
Messinger Michael
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