Molten-metal liquid level sensor
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United States of America Patent
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-
Jan 31, 1984
Grant Date -
N/A
app pub date -
Dec 4, 1981
filing date -
Dec 4, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A level sensor for measurement of the level of molten metal in an electron beam evaporator which operates to sense directly the position of the point or line source of evaporant by detection of radiation such as light emitted therefrom. Compensation is provided for variations in electron beam deflecting magnetic field to avoid interpreting lateral movement of the point or line source from field variations as level changes. Compensation is also provided in the detection circuit for variations in detected light intensity that would otherwise provide an erroneous indication of level change. Detection of further conditions that produce unreliable level sensing and system inhibition in response thereto is provided as a safety feature.
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