Device for measuring the modification time of the physical state of a fluid medium
US4918984A · kind A · utility
32Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Dec 30, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2101/23
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and device for determining the time of modification of the physical state of a fluid medium of the kind in which a ferromagnetic ball is placed in the bottom of a cup containing the fluid to be studied and driven with a periodic movement under the effect of an external magnetic field and in which the modifications of the movements of this ball, due to the modification, are detected. The method is characterized by the fact that the ball always follows at each period the same imposed path and in that the amplitude variations and/or the frequency of its movement are detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.