Fluid measurement

Details Fluid measurement Fluid measurement

1977-02-14

1978-10-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73290R, G01N 2126

Patent

active

041198603

ABSTRACT:
This invention relates to sensing in respect to fluids and utilizes an effect relating to a beam of light and a fluid boundary. It has been found that a beam of light will be modulated differently when submerged and unimmersed in a fluid and also that between these two limit positions critical levels of the beam with respect to the boundary exist in which light transmission is at a maxima and a minima. These maxima and minima can be put to use in liquid level detection and control.

REFERENCES:
patent: 2256595 (1941-09-01), Metcalf
patent: 3120125 (1964-02-01), Vasel
patent: 3995168 (1976-11-01), Neuscheler et al.
patent: 3995169 (1976-11-01), Oddon

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