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1 March 2008 Particle size measurement in glass powder beds using optical coherence tomography
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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.
©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
Jocelyn Veilleux, Christian Moreau, Daniel Lévesque, Marc L. Dufour, and Maher Boulos "Particle size measurement in glass powder beds using optical coherence tomography," Optical Engineering 47(3), 033601 (1 March 2008).
Published: 1 March 2008

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