Fiber optic liquid level sensor

Details Fiber optic liquid level sensor Fiber optic liquid level sensor

1988-05-16

1989-06-06

Sikes, William L.

G02B 636, G02B 726

Patent

active

048366323

ABSTRACT:
A fiber optic liquid level sensor having a vertical tube which may be placed in a vessel containing the liquid to be sensed. Disposed for free movement along the exterior of the tube is an annular float equipped with a magnet. A fiber optic cable containing two optical fibers is attached to the top of the tube and the optical fibers extend to a selected point where it is desired to sense the liquid level. There the fibers terminate facing a movable mirror to which a magnet is attached. With a rising liquid level, the mirror is carried upward by the magnetic linkage of the magnet on the float and the magnet to which the mirror is attached. When the mirror reaches the focal point of the optical fibers, the light circuit is closed and an electrical signal derived therefrom may be used to open or close a switch. When the liquid level falls so that the mirror drops below the focal point of the optical fibers, the light circuit will be opened. The optical fibers are completely isolated from the environment of the liquid and, thus, the sensor may be used in hazardous locations.

REFERENCES:
patent: 4038650 (1977-07-01), Evans et al.
patent: 4201086 (1980-05-01), Jones
patent: 4261638 (1981-04-01), Wagner
patent: 4379289 (1983-04-01), Peek
patent: 4398789 (1983-08-01), Pryor
patent: 4410020 (1983-10-01), Lorenz

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