Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1987-06-29
1988-11-01
Willis, Davis L.
Optics: measuring and testing
For size of particles
By particle light scattering
250564, 250574, 356338, 356340, G01N 1502, G01N 2149
Patent
active
047814608
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.
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B. E. Dahneke, "Measurement of Suspended Particles by Quasi-Elastic Light Scattering," John Wiley & Sons, New York, 1983.
Coulter Electronics of New England, Inc.
Koren Matthew W.
Willis Davis L.
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