In emulsion systems one of the key points is to directly obtain information on both mobility and polydispersity from the experimental data. Recently we proposed a polynomial method to obtain the dispersed phase self-diffusion coefficient from experimental data lying on the left of a limiting value of delta (the characteristic magnetic field gradient pulse time in a PGSE-NMR experiment). However, if the mean radius of the droplet is small, all of the experimental points are located on the right of this limiting value, and a new computational strategy is proposed to achieve the self-diffusion coefficient and the distribution function at the same time. PGSE-NMR results and optical microscopy literature data are compared to test the method.