A measurement method of 3D coordinates of tracers for 3D-PTV

In this paper, a new efficient measuring method of the three-dimensional coordinates of distributed tracers is proposed. In general, a method of measuring the coordinates is one of the key processes in the three-dimensional particle tracking velocimetry (PTV). Because theaccuracy of the measurement influences not only the reliability of the measured velocities but also the efficiency in finding stereo-pairs and the performance in tracing motion of tracers.The performance of the present method is achieved by two algorithms for stereo-pair matching and accuracy improvement which are based on a conditional arrangement of cameras.