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