Abstract
The characteristic of fluctuation of scattered light from ultra fine particles carries information about diameters of particles. This information is traditionally extracted by photon correlation spectroscopy (PCS). For this technique, temporal autocorrelation function is utilized to analyze fluctuating scattered light of particles to get information of particle size. Besides temporal autocorrelation function, both temporal coherence degree and fractal dimension of scattered light from ultra fine particles can also be used to diagnose diameter of particles. From experiments, the fractal dimensions of dynamic scattered light intensity signal of particles with the diameter of 60nm, 90nm, 200nm, 300nm and 450nm were obtained. Experimental results showed the monotony relationship between fractal dimension of scattered light intensity signal of particles, which indicates that the fractal dimension of scattered light signal can also be used to analyze particle size. However fractal dimension, as well as temporal coherence degree, can only provide the mean particle size, not the particle size distribution.
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