Measurement of material level in vessels

Details Measurement of material level in vessels Measurement of material level in vessels

1978-12-18

1981-01-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01N 1506

Patent

active

042477840

ABSTRACT:
Apparatus and method are disclosed for determining the level of a light-reflecting substance with regard to a reference point. The apparatus and method comprise directing a beam of light at the substance, receiving the diffuse reflected light on an arrangement of photoelectric sensor elements in a manner such that displacement of the reflected light from a predetermined position on the sensor element arrangement is sensed electronically, generating an electrical signal which is proportional to the displacement of the reflected beam from the predetermined position on the element arrangement, and using the electrical signal to determine the amount of deviation of the level of the substance from a predetermined reference point.

REFERENCES:
patent: 2350820 (1944-06-01), Rettinger
patent: 4053234 (1977-10-01), McFarlane

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