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Single-particle statistics derived from light-blockage instruments

Authors
Journal
Powder Technology
0032-5910
Publisher
Elsevier
Publication Date
Volume
57
Issue
2
Identifiers
DOI: 10.1016/0032-5910(89)80018-x

Abstract

Abstract This study examines the distribution of measured diameters of single particles. Diameter distributions of six particles were compared with the theoretical gamma, chisquared, and Student's t distributions. Five aluminum oxide particles of varying shape, and a nitrocellulose spheroid were each repeatedly sized thirty-two times using a light-blockage particle counter. For each observation, an equivalent diameter was calculated from the projected cross-sectional area of the particle. Mean diameters and standard deviations were then calculated from these values. A qualitative description of each particle's shape was determined using a scanning electron microscope. The shapes ranged from spheroidal to flake-like. Using the Student t distribution and specified confidence levels, an estimate was also made of the minimum number of trials necessary to reproduce the experimental results.

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