Device for measuring viscosity and device for measuring characteristics of fluid
US5889351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1995 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Nov 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02818
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A viscosity measuring device is equipped with a piezo-electric vibrator, an oscillator and a loss factor monitoring means. The elastic properties of the piezo-electric vibrator and the viscous resistance of the fluid are controlled so that the tangent of loss factor of the piezo-electric vibrator may change largely enough to measure the viscosity. The characteristics measuring device is equipped with a first ceramic plate, a piezo-electric element sandwiched between a pair of electrodes attached to one surface of this first ceramic plate, a second ceramic plate having a hollow portion therein sintered integrally with the first ceramic plate, and a lid disposed so as to sandwich the second ceramic plate between the lid and the first ceramic plate and so as to face the other surface of the first ceramic plate. The amount of a glass component on the other surface of the first ceramic plate is regulated to be smaller than that of the glass component on the one surface of the first ceramic plate. The device for measuring the viscosity of a fluid can easily measure the viscosity with the good reproducibility even in the flowing fluid irrespective of the magnitude of the viscosity, and an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.