The Simple Drop-sizing System Using Image-sensor and Laser-diffraction Setup with Additional Lens-pair and Small Awning on the Intermediate Focal-plane

Abstract

The Simple Drop-sizing System Using Image-sensor and Laser-diffraction Setup with Additional Lens-pair and Small Awning on the Intermediate Focal-plane Takashi SUZUKI Particle-sizing is requisite in research and development on dispersive two-phase flows. The commercial measuring devices are generally expensive, and cheaper devices would be helpful to the academic researches. From this point of view, the author developed the simple drop-sizing system which was based on the laser diffraction method and utilized an image-sensor to obtain angular distribution of the scattered light-intensity from particles. The system had been opened for academic researchers. During the trial, it was pointed out that setup of the system was not so easy because of the difficulty in putting an awning upon the delicate image-sensor. The system is improved by adding a lens pair to the basic optical-setup to generate intermediate focal-plane and placing the awning on the plane. Optimized diameter of the awning was smaller than that for previous system. As the results, the faults of previous system were canceled and also the range of diameter measurement was extended. The improved drop-sizing system is outlined and the results of several test measurements are presented. Based on the results, utility of the system was discussed.