performance of such a compact system with a diode laser is Fiber optic dynamic light scattering (FODLS) is fast developing compared with a system with a He-Ne laser. Although fiber as a technique for sizing particles in concentrated dispersions. optic dynamic light scattering (FODLS) has been an active Fiber optic systems have the potential to be made into online field of research, the range of applicability of such systems particle size measuring equipment in process industries. Two difis not clear. The fiber optic systems have been claimed to ferent laser light sources were used to study monodisperse polystyhave online particle sizing capabilities. It is the intent of this rene latex dispersion with different particle sizes and volume fracwork to explore whether such online particle sizing systems tions. The apparent diffusion coefficients were a function of partican be constructed using fiber optics. The range of applicacle size, volume fraction, and signal to noise ratios. The apparent bility of FODLS systems has been explored using a He-Ne diffusion coefficient data showed that FODLS probes collective diffusion for smaller particles and self diffusion for larger particles. laser as the light source. Finally, the performance of FODLS It was observed that for a polydisperse concentrated dispersion, systems with diode lasers has been compared to the perforboth self and collective diffusion were probed by FODLS. This mance of FODLS systems with He-Ne lasers. The theory means that the apparent diffusion coefficient can be used only as pertinent to this work has been presented in the next section.
a relative quantity. α§ 1997 Academic Press
A more detailed description can be found in Ref. (7).