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Optical Engineering

Particle size measurement in glass powder beds using optical coherence tomography
Author(s): Jocelyn Veilleux; Christian Moreau; Daniel Lévesque; Marc L. Dufour; Maher Boulos
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Paper Abstract

Optical coherence tomography was used to collect cross-sectional images of glass powder beds consisting of microspheres with diameters ranging from 8 to 175 μm. Images were formed by a collection of individual interferogram envelopes that give the backscattered light amplitude as a function of the optical path in the glass powder bed. The diameter distribution, for microspheres located near the surface of the beds, is obtained by appropriate peak distance measurements on threshold-selected envelopes after having performed the surface profilometry. The measured distributions are in good agreement with those obtained by laser diffraction. When considering the whole powder volume, the evaluation of the mean light penetration depth inside the powder beds proves to be a useful approach to evaluate the mean particle diameter, although no information is obtained on the actual particle size distribution in this case. Two simplified models are introduced to understand the linear relationship observed between the penetration depth and the mean particle size.

Paper Details

Date Published: 1 March 2008
PDF: 9 pages
Opt. Eng. 47(3) 033601 doi: 10.1117/1.2896455
Published in: Optical Engineering Volume 47, Issue 3
Show Author Affiliations
Jocelyn Veilleux, McGill Univ. (Canada)
Christian Moreau, National Research Council Canada (Canada)
Daniel Lévesque, National Research Council Canada (Canada)
Marc L. Dufour, National Research Council Canada (Canada)
Maher Boulos, Tekna Plasma Systems Inc. (Canada)


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