Quasi-static viscometer
US6178811A · kind A · utility
19Cited by
8References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Mar 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A viscometer having a fluid volume-displacer or driver, such as a speaker membrane, and a pressure sensor or detector, such as a microphone membrane, forming the inside surfaces of a cavity that is sealed from the ambient environment of the viscometer except for a controlled leak such as a capillary tube. An electrical signal from the sensor or detector is processed to indicate viscosity of the fluid in the cavity. Additionally determined from the viscosity are heating value, oxygen demand and other thermophysical properties of the fluid. Also, absolute pressure is derived after viscosity is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.