There exists a serious need for a continuous liquid level sensing device for use in cryogenic liquids. An optical probe that will emit an amount of light directly proportional to the height of liquid in a Dewar is described. The optical output signal of the probe will be changed to an electrical signal by means of a photocell or a phototransistor.
Proceedings of the Iowa Academy of Science
©1961 Iowa Academy of Science, Inc.
Munson, John M.
"Liquid Level Sensor,"
Proceedings of the Iowa Academy of Science, 68(1), 502-503.
Available at: https://scholarworks.uni.edu/pias/vol68/iss1/68