Abstract
Since the life of tracer particles is very short in an airflow visualization using smoke or mist particles, it is difficult to fill the whole space with tracer particles. Therefore, tracer particles are supplied locally by predicting flow direction and the plane which is expected to include main flow is illuminated by a light sheet. Although velocity vectors are usually assumed to be two-dimensional in an airflow measurement through pattern tracking, the velocity componen tperpendicular to the visualized plane exists frequently in a real situation. In this paper we propose a new technique in which two planes perpendicular to camera axis are visualized simultaneously and the velocity component perpendicular to the planes is calculated from the differenc eof two images. The performance of the technique is investigated by a numerical experiment.
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