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Proceedings Paper

Fiber Optic Reading Heads For Diffraction Pattern Analysis
Author(s): A. G. Naylor; B. H. Kaye
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Paper Abstract

The shape of particles in a powder system, slurry or aerosol affects many of the properties of the particles in these systems, e.g., sintering, heat transfer, settling, in particular the problems associated with inhalation of fibrous dust pose many difficult problems in industrial hygiene. The determination of a shape parameter for a particle however has proved to be a difficult task. The classic studies of shape parameters were carried out by Heywood using large particles which were easy to handle, eg., rock fragments (Ref. 1) Heywood's work was extended by Hausner to metal powders (Ref.2). The ratio of the difference in size of a particle as measured by two different techniques, e.g., microscope measurement and sedimentation measurement has also been used as a shape parameter. Medalia has carried out extensive work on shape characteristics of carbon black flocs but the method has the disadvantage of requiring many computer calculations (Ref. 3) Most of the work on shape characterization of small particles deals with assessing in some way the two dimensional projection of the particle profile. An interesting development has been to generate a wave from a particle profile by rotating a radius vector about some point within a particle profile as illustrated in figure (1). (Ref. 4) The wave is then characteristic of the particle profile and the wave itself may be described by its Fourier components. The centre of rotation chosen is the centroid and the disadvantage of this method is the problem of locating the centroid and performing the measurements of the lengths of the radius vector. Kaye has suggested a simple way to overcome both of these problems by plotting angle of rotation against Feret's diameter. (Ref. 5) This parameter however has to be interpreted with care for re-entrant particle profiles.

Paper Details

Date Published: 1 April 1973
PDF: 8 pages
Proc. SPIE 0031, Fiber Optics Comes of Age III, (1 April 1973); doi: 10.1117/12.953581
Show Author Affiliations
A. G. Naylor, Laurentian University (Canada)
B. H. Kaye, Laurentian University (Canada)

Published in SPIE Proceedings Vol. 0031:
Fiber Optics Comes of Age III
Walter P. Siegmund; Clyde T. Holliday, Editor(s)

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