A laser beam is focussed on to a capillary by means of a lens, mirror and beam splitter system and measurement of the velocity of the blood cells in a direction substantially perpendicular to {HEAD ~ the surface} of {TAIL ~ the tissue} is effected by detecting directly back scattered radiation 
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A laser beam is focussed on to a capillary by means of a lens , mirror and beam splitter system and measurement of the velocity of the blood cells in a direction substantially perpendicular to { HEAD ~ the surface } of { TAIL ~ the tissue } is effected by detecting directly back scattered radiation
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