Fibre-optic systems for dynamic light scattering — a review

Abstract ‘Photon correlation spectroscopy’ has become a standard method in applied science for analysing the properties of submicron particles in a fluid environment. The fast, local fluctuations in the intensity of the light scattered from such particles are recorded and analysed in terms of the local motions. This has led to the use of the method both to characterize particle geometry and to monitor particle translation as a marker for fluid flow. The advent of fibre-optics has enabled portable, small, remote and more flexible systems to be established in recent years. This paper reviews those instrument designs which have represented advances in the development of fibre-based systems. Emphasis is laid on instruments (a) for monitoring blood flow and (b) for measuring Brownian-induced translatory diffusion in colloidal suspensions.

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