Combination water contaminant and fuel density detector

Details Combination water contaminant and fuel density detector Combination water contaminant and fuel density detector

1979-03-23

1981-03-17

Corbin, John K.

Optics: measuring and testing

For optical fiber or waveguide inspection

73293, 250577, 356133, G01N 2100, G01N 2141, G01N 2184

Patent

active

042564034

ABSTRACT:
A device for detecting the presence of contaminating water in a fuel tank as well as for measuring the density of the fuel in the tank which includes an elongated body of optical material arranged to be mounted in a fuel tank in a vertically extending position, one side face of the body forming an interface with the fluid in the tank, and a plurality of light sensors on the opposite face of the body arranged in spaced-apart relationship, together with light-emitting means at the bottom of the body which emit a divergent group of rays of successively increasing angles of incidence upwardly so that those rays exceeding the critical angle at the interface for a fuel of a specific index of refraction are reflected to illuminate those sensors corresponding to the rays exceeding the critical angle to thereby provide a detected output representing the density of the fluid, the light-emitting means providing a second group of rays striking the lower portion of the interface which are reflected when water is present to illuminate another light sensor for indicating such water presence. This invention relates to a fuel detector and more particularly to a detector for indicating both fuel density and the presence of water in a fuel tank.

REFERENCES:
patent: 2976763 (1961-03-01), McKeag
patent: 3683196 (1972-08-01), Obenhaus
patent: 3932038 (1976-01-01), Schweizer et al.

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