Abstract
The paper describes the development of planer sizing technique for micro-bubbles based on the interferometric laser imaging for droplet sizing method and the improvement for the smaller bubble sizing beyond the conventional 45degree observation techniques. The novel measurement scheme of smaller bubbles whose diameter is less than 10fim was investigated by Lorenz-Mie scattering analysis and the technique was applied to the measurement of micro-bubbles obtained by electrolyzation and microbubble pump.