NASA NTRS · 19630000066
Liquid-level meter has no moving parts
Abstract
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.
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Escue, W. T.. 1964-06-01. Liquid-level meter has no moving parts. https://ntrs.nasa.gov/citations/19630000066
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