Abstract
The spatial filtering velocimetry is the basis of the new optical hydrometric measuring probe. Like a laser Doppler velocimeter, the hydrometric probe determines the velocity of tracer particles in the liquid flow. Essential parts of the hydrometric probe are a differential fibreoptical spatial filter and an illumination source. The tracer particles are imaged onto the spatial filter by a shadow projection with a parallel light beam. The hydrometric probe can be used for velocity and flow measurements in pipes and river flows. The technique permits the design of robust and low cost optical hydrometric probe which can be used for different hydrometric applications.
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