Process and device for measuring the level of the free surface of a liquid
US4825383A · kind A · utility
12Cited by
9References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | May 20, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.