Noncontact on-line measurement of the viscosity of liquid paint
US5005401A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1990 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Feb 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for non-contact measurement of the viscosity of a liquid such as paint. In accordance with the method and apparatus, the surface of a liquid is perturbed with a standing wave of predetermined wavelength. This perturbation is effected by directing a burst of air against the surface of the liquid using periodically spaced air nozzles. The frequency and rate of decay of the induced surface wave is measured using typically optical means including a reflected light beam. The measured frequency and decay rate are combined with the known depth of the liquid sample in a computing circuit to provide a measurement of fluid viscosity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.