Abstract
An instrument based on an imaging technique and laser Doppler velocimetry (LDV) was developed and evaluated for sizing particles of irregular shape. The signals from particles were detected by a 32 channel linear photodiode array focused on the measuring volume and the image was reconstructed from ‘sliced’ images of the particle provided by temporal outputs from each channel. The present instrument consists of a multi-channel transient recorder and independent, single-channel LDV processor, and provided size, velocity, shape and trajectory information of particles ranging from 30 to 250 µm with velocity up to 3 m/s; the particle size was obtained from the area of the shadow image and the trajectory was inferred for defocused images by cross-correlation between two images projected by two incident beams of the conventional LDV. For determination of particle size distribution, the biasing effect, caused by the size dependence of the sampling space, were eliminated by a correction scheme. The accuracy of the average size for spheres was better than 3.0% referred to that measured by a microscope. The size distribution of non-spherical particles was similar to microscopic measurement and the maximum difference in arithmetic average diameter was approximately 10%.
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© 1996 Springer-Verlag Berlin Heidelberg
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Morikita, H., Hishida, K., Maeda, M. (1996). Measurement of Size and Velocity of Arbitrarily Shaped Particles by LDA Based Shadow Image Technique. In: Adrian, R.J., Durão, D.F.G., Durst, F., Heitor, M.V., Maeda, M., Whitelaw, J.H. (eds) Developments in Laser Techniques and Applications to Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79965-5_24
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DOI: https://doi.org/10.1007/978-3-642-79965-5_24
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