Particle sizing in concentrated suspensions by use of steady-state, continuous-wave photon-migration techniques.

We demonstrate a new approach for determining particle-size distribution in concentrated suspensions from spectral measurement of isotropic scattering coefficients by use of steady-state, continuous-wave photon-migration techniques. Successful recovery of particle-size distribution for TiO(2) suspensions in the form of log-normal functions is achieved through a regularized inverse algorithm, into which a synthesized scheme of Marquardt and Tikhonov regularizations has been incorporated. Our results for dense TiO(2) suspensions with three different particle concentrations are in excellent agreement with the size distribution as measured with x-ray sedimentation.