High-frequency acoustic rheometer and device to measure the viscosity of a fluid using this rheometer
US5302878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Oct 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0422
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An acoustic rheometer working in the high frequency range comprises a torsional-mode transducer which is a crystal of the sillenites class, having a height that determines the resonance frequencies of the mode of torsion, and being provided with an electrical excitation means. Furthermore, the sensor is a rod made of an iron/nickel alloy having a very low thermoelastic coefficient. The rod is rigidly connected to the transducer. The respective diameters of the transducer and of the sensor are chosen so that the coefficient of reflection at the transducer/sensor interface is zero. The rheometer can be used in ink-based printing systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.