一様流中に直角に噴出した噴流の拡散 : 第2報,トレーサ粒子の空間密度から濃度を計測する方法

概要

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In our 1st report we reported on the simultaneous measurement of velocity vector and concentration. But there were some problems in the measurement of concentration. So we have conducted a basic experiment. Water containing polystyrene particles is agitated in a square vessel and illuminated by a slit beam light. A TV camera takes many instantaneous pictures and sends them to an image processor. A computor translates these pictures into binary images and adds these images to a gray image. Finally we can get brightness proportional to particle concentration. From this experiment, we have shown that (1) a proper threshold value and a low concentration is needed ; and (2) the variance of brightness decreases by the number of additions and dilatations.
1988-06-25