UNCERTAINTY COMPONENTS INTERACTION ON THE WATER JET VELOCITY MEASUREMENT BY LASER VELOCIMETRY

The present study deals with a laser Doppler dual-incident-beam velocimeter in reference-beam configuration developed at the Water Jet Lab of the Dipartimento di Meccanica of the Politecnico di Milano and especially designed for water jet applications. The applied experimental procedure makes it possible, once identified the contributors to the uncertainty of the measurand, to apply an analysis of variance in order to point out if the contributors and their interaction effects are statistically effective on the measurand variability. This work makes it possible to obtain an objective evaluation of the uncertainty sources which influence the fringe spacing in the measurement volume and the water jet velocity. This way it is possible to point out how to obtain the improvement of the measurement system acting on them.

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