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Abstract
The assessment of particles in terms of their size and shape, as well as concentration (number of particles per unit volume) is of crucial importance in a wide range of applications, both industrial and medical.Ellipsometry is an optical technique using polarised light which can be used for such purpose. However,in its simple form ellipsometry is a time-consuming measurement technique. We have investigated the possibility of constructing a multi-channel ellipsometer to overcome this disadvantage and in this paper we report on the use of this instrument for the assessment of a range of particles of known size and concentration.