THREE DIMENSIONAL VELOCITY MEASUREMENT USING TRACER-PARTICLE-TRACKING METHOD
Akikazu KAGA, Yoshio INOUE, Katsuhito Yamaguchi, Akira YOSHIKAWA · JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN · 1989
The performance of a system which determine 3D velocity distribution using particle-tracking method, through image processing of visualized image recorded with two TV cameras, are discussed. In the system, after determining camera parameters from a landmark image, 2D vectors are identified in each camera image using particle-tracking method, and 3D vectors are reconstructed through stereo- pair-matching. It is shown experimentally that position estimation error projected on screen coordinate was about one pixel. Estimation error of 3D position was analyzed as a function of 2D error, angle between camera axes, etc. The performance of stereo-pair-matching was analyzed as a function of 2D error, angle between camera axes and tracer concentration. It is shown also experimentally that error in velocity measurement is within tolerance.