519 デジタルカラー画像処理と三次元PTVを用いた気泡流計測(混相流・自由表面を含む流れの諸問題II)(OS.7 混相流・自由表面を含む流れの諸問題)

概要

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In this paper the study on a three-dimensional PTV measurement of bubbly flow with color digital image processing is presented. The tracers for the liquid motions shine with yellow-green by an ultra-violet illumination. The bubbles are shadow of the incandescent lights with red-colored cellophane sheets. By using six mirrors the images of the test section seen from different three directions are led to a high-speed color video camera. Both the adequate lightning method and the exact camera calibration are important for the three-dimensional PTV. Color digital image processing makes the bubbles and tracers extracted from images. The velocity vectors of both the bubbles and tracers, and the three-dimensional shapes of the bubbles are obtained by the present system.
2001-03-09