Fluid level monitoring through fluid cell protrusion

Details Fluid level monitoring through fluid cell protrusion Fluid level monitoring through fluid cell protrusion

1978-06-22

1980-03-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01N 2126

Patent

active

041930045

ABSTRACT:
Monitoring the level of both opaque and clear liquids in a reservoir without contacting the liquids by providing first and second reservoir wall portions that define a region through which a light beam is passed from a light source to a light sensor so that opaque liquid extinguishes the light beam and so that the wall portions cooperate with the clear liquid to refract the light beam away from the sensor. A monitoring line segment, defined as the portion of a hypothetically unrefracted and unreflected light beam between the first and second reservoir wall portions, is a small fraction of the largest interior linear dimension of the reservoir in a plane containing the monitoring line segment and a line normal to the first reservoir wall portion.

REFERENCES:
patent: 2882520 (1959-04-01), Hass
patent: 3065354 (1962-11-01), Bird
patent: 3549893 (1970-12-01), Gibbs
patent: 3636360 (1972-01-01), Oishi et al.
patent: 3851181 (1974-11-01), Heule

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