Process and device for measuring the level of the free surface of a liquid
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United States of America Patent
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Apr 25, 1989
Grant Date -
N/A
app pub date -
May 20, 1987
filing date -
Jun 4, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention belongs to the field of dimensional metrology. The process according to the invention makes use of a hot wire sensor (1) passing through the free surface of the liquid. The wire is heated by a joule effect up to a temperature To. The supply to the wire is then interrupted for a predetermined time interval .tau.. The current passing through the wire at the two instants forming the bounds of this interval is determined by means of an A/D converter (3) which feeds a control and computing unit (4). From these current measurements this unit derives a value which represents the liquid level.
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