Fiber optic fluid impurity detector

Details Fiber optic fluid impurity detector Fiber optic fluid impurity detector

1984-02-06

1985-10-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250573, 356133, G02B 514

Patent

active

045448400

ABSTRACT:
A generated signal is passed through an elongated signal conveying element positioned preferably perpendicular to the surface of a fluid the level of which is to be measured. The signal is directed from the signal conveying element to a detector element which senses the signal output from the signal conveying element. The signal output detected in an optical embodiment varies logarithmically with the depth of immersion of the signal conveying element into the fluid. A preferred embodiment employs an electromagnetic wave, e.g., light, signal which passes through a light pipe signal conveying element. By nearly matching the light pipe index of refraction with that of the fluid, a predetermined percentage of the wave is lost into the fluid each time the light is reflected further along the pipe. The portion of light sensed at the detector, which is located where the unrefracted light exits, is readily converted to an output which varies linearly with the depth the light pipe signal conveying element is immersed into the fluid length.

REFERENCES:
patent: 3303699 (1967-02-01), Scott
patent: 3370502 (1968-02-01), Wilks
patent: 3433570 (1969-03-01), Hansen
patent: 3902807 (1975-09-01), Fleming et al.
patent: 3975084 (1976-08-01), Block
patent: 4302677 (1981-11-01), Albertsson

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