MEASURING METHOD AND DEVICE FOR DIAMETERS AND DISTRIBUTIONS OF MICROBUBBLE AND MICRODROP

摘要

PROBLEM TO BE SOLVED: To measure a diameter of a defocusing image obtained by defocusing and a number of an interference fringe in the defocusing image to expand the measurement method for a diameter and space distribution for a micro drop to the measuring method for a microbubble and a microdrop, and enable application of the measurement method to a case that space distribution concentration of the micorbubble and the microdrop is high. SOLUTION: A sheet-like and parallel laser beam 2 irradiates to liquid space that a microbubble 10 is floated. The microbubble 10 irradiated by the laser beam 2 is taken by defocusing at a defocusing face 8 from a side face direction with an angleθto a running direction of the laser beam 2 through an object lens 6. The number of the interference fringe 9 in a defocusing image 10" corresponding to the microbubbles 10 and thereafter the diameter of the microbubble 10 is determined in accordance with an equation (4).