Method and particle analyzer for determining a broad particle size distribution
US8681215B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2011 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Dec 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/1493
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a particle analyzer are provided for determining a particle size distribution of a liquid sample including particles of a lower size range, particles of an intermediate size range, and particles of an upper size range. A dark-field image frame is captured in which the particles of the lower size range and the particles of the intermediate size range are resolved, and a bright-field image frame is captured in which the particles of the intermediate size range and the particles of the upper size range are resolved. Absolute sizes of the particles of the intermediate size range and the particles of the upper size range are determined from the bright-field image frame. Calibrated sizes of the particles of the lower size range are determined from the dark-field image frame by using the particles of the intermediate size range as internal calibration standards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.