Measurement of 3-D Velocity in a Water Vessel Applying Binary Image Correlation Method

Abstract

A few measured examples of three-dimensional flow utilizing the binary-image correlation method have been reported so far. In this paper, authors are going to add a new example, in which three camera-stereo set is employed for measuring coordinates of tracer particles combining a self-collimating technique. A mixing flow in a rectangular water vessel is measured through a side wall of the vessel. The present measuring system is composed of a three-video-camera stereo-set, frame grabbers and a personal computer for analyzing a series of pictures. Not a few false vectors are contained at the first estimation of timewise correspondences of particles, then, at the second step, those false vectors are eliminated by applying thresholding to the values of correlation coefficients.