Plural wavelength fiber optic liquid level sensor for multiple l

Details Plural wavelength fiber optic liquid level sensor for multiple l Plural wavelength fiber optic liquid level sensor for multiple l

1991-06-27

1992-11-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022723, 25022725, G01N 1506

Patent

active

051646080

ABSTRACT:
A fiber optic liquid level sensor for measuring the level of multiple immiscible liquids in a container (20). An end of an optical fiber (24) is immersed in the liquids in the container (20). Light is injected into the other end of the fiber. The ratio of transmitted to the reflected light is dependent on the evanescent mode losses to the liquids in the container. The levels of the liquids are derived from the losses, since the absorption per unit length of the fiber is different for each liquid. The relative amounts of liquids in the container are obtained from the amount of absorption.

REFERENCES:
patent: 4045668 (1977-08-01), Pitt et al.
patent: 4287427 (1981-09-01), Scifres
patent: 4544840 (1985-10-01), Keller
patent: 4644177 (1987-02-01), Barabino
patent: 4851665 (1989-07-01), Pesavento et al.
patent: 5077482 (1991-12-01), Vali et al.

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