改良液浸法による微粒子の屈折率の測定

抄録

The usual liquid immersion method is modified for accurate measurement of refractive index of polydisperse fine particles. Instead of the direct observation of scattered light intensity, we developed new optical arrangement based on a multi-line laser and an optical multichannel analyser. It was applied to the measurement of monodisperse Silica sphere and polydisperse Allophane particles. The liquid immersion method, which was conventionally used to measure the refractive index, determine the rafractive index by observing the change of the scattered light intensity from fine particles immersed in dispersion liquid by eyes, on the other hand the modified method by measuring the scattered light intensity from fine particles irradiated with a multi beam laser by an optical multichannel analyzer. It was eatimated that the refractive indices determined by the modified method were mostly equivalent to the specific values of Silica particles and refractive indices of Allophane particles found in the references.