System for measuring the size distribution of particles dispersed in a fluid
US4781460A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1987 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Jun 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/0222
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method which provides a measure of the size distribution of particles dispersed in a fluid based upon an optimum combination of CLS measurements and DLS measurements. The measurement is characterized by relatively high resolution particle sizing. DLS data representative of the autocorrelation function, or power spectrum, of the detected intensity of scattered light for m measurement conditions of a sample, is optimally combined with CLS data representative of the average total detected intensity of scattered light for n measurement conditions, to provide an angle-independent, high resolution size distribution v(r), where m.gtoreq.1, n.gtoreq.0, m+n.gtoreq.2, and at least two of the measurement conditions are different. The size distribution may be expressed in terms of the continuous function v(r) or the histogram v, and may represent distributions weighted by mass, volume, number, surface area, or other measures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.