Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-08-04
1976-11-30
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250573, 250227, 73293, G01N 2126
Patent
active
039951685
ABSTRACT:
A device for the outside display of the level and specific density of a liquid contained within a tank, particularly for inflammable liquids, characterized by a plurality of paired light pipes having optical interface means therebetween located at intervals within a support with electrical means operable by light energy from one of the pair of light pipes being conducted thereby due to a mismatch of the index of refraction caused by an absence of fuel at the area of the optical interface to provide a display of the fluid level and/or the density of the fluid within a tank.
REFERENCES:
patent: 3120125 (1964-02-01), Vasel
patent: 3553666 (1971-01-01), Melone
patent: 3636360 (1972-01-01), Oishi et al.
patent: 3683196 (1972-08-01), Obenhaus
patent: 3773426 (1973-11-01), Mudd
patent: 3844171 (1974-10-01), Rodger
Connelly John J.
Neuscheler Frederick
Geib Richard G.
Gill Mellor A.
Grumman Aerospace Corporation
Moore David K.
Smith Alfred E.
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