Abstract
A stereoimaging technique was applied to the measurement of size and velocity of nonspherical fine particles. This technique was previously developed by us and verified by the measurement of transparent glass beads falling in a pipe. In the present study, several transparent/opaque and spherical/nonspherical particles, each approximately 100 μm in mean diameter, were measured to demonstrate the applicability of this technique to a wide range of particle shapes and particle materials. The measured size distributions were in reasonable agreement with those measured separately by a microscopy. The three-dimensional velocity measurement was also shown to give reasonably good results. Furthermore, the measured characteristics of the particle shape such as the maximum length, the width and the aspect ratio were compared with those obtained by the microscopy. Some statistical features of the attitude of falling particles were also discussed.
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