Development of a 3-D Measurement System for Bubbly Flow by Color Image Processing

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  • 220 カラー画像処理を用いた気泡流3次元計測システムの開発
  • カラー ガゾウ ショリ オ モチイタ キホウリュウ 3ジゲン ケイソク システ

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Abstract

This paper presents a measuring system for bubbly flow by a three-dimensional color image processing. The system is based on an usual particle tracking velocimetry (PTV). Fluorescent micro-capsules are used as the particles to track the motions of liquid. The micro-capsules shine with yellow green by an ultra-violet illumination. Incandescent lights with red-colored cellophane sheets are used as back lighting. Using the above mentioned illumination, the bubbles are colored by black, the micro-capsules by yellow green, and the background by red. A high-speed color video camera with four mirrors is used to obtain two images taken from two different directions that are diagonal from each other. The obtained images are transformed temporary to Windows-BMP files. The BMP files are divided into three different text data that represent the color values of red, green and blue, respectively. The bubbles and micro-capsules are extracted separately by using these three different data. Although the bubbles and particles are extracted precisely, the motions of them are not calculated well because diagonal two images are not sufficient for the 3-D tracking.

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