An electro-optical system, without moving parts, reliably indicates liquid levels at cryogenic temperatures. Glass prisms, which act as liquid level probes inside the tank, extend from optically aligned photoelectric assemblies mounted on the outside.
Liquid-level meter has no moving parts
1964-06-01
Miscellaneous
No indication
English
LIQUID LEVEL METER, SPRAYING ASSEMBLY, AND UNMANNED AERIAL VEHICLE
European Patent Office | 2021
|NTRS | 1998
Online Contents | 2008
Differential sound-level meter
NTRS | 1977
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