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Three simple laser Doppler microscope systems suitable for measurements of material flow in narrow vessels with widths from 10 to 250 mu m or greater are described. Measurements of centre-line flow velocities in model narrow channels with widths in the range 60-250 mu m are reported. Velocities of the order of a few mm s -1 were measured; considerably slower velocities are also accessible. Such measurements are likely to be of great interest to biologists.
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Cochrane et al. (1978) studied this question.
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