Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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1994, Volume4

Issue 1

121 pages

Issue price - $75.00

Ki Seong Kim
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Gu, Taejon 305-701, Korea

Sung-Soo Kim
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon, South Korea

A PC-based spray imaging system has been constructed to count and to size small particle images (calibrated down to 3.9 μm in diameter). The main objective was to develop a reliable calibration procedure in the spray imaging system for drop sizing, particularly in the range of small particles, and eventually to construct an image processing algorithm for automatic sizing and counting of the particle images. The image characteristics of the calibration reticle were investigated for this purpose, and it was found that there were, in fact, useful parameters appropriate in determining the optimum threshold gray level for drop sizing and selecting the in-focus droplets. Using these parameters, it was found that a rather simple linear relationship existed between D₅₀ (diameter measured with 50% threshold gray level) and real size. Very small errors were detected in the in-focus droplet selection and drop sizing, which were confirmed by the tests employing the calibration reticle and applying the above-mentioned calibration procedure and image processing algorithm.

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