Centrifugal sedimentation data analysis by analogue deconvolution

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Abstract
A new method is presented for obtaining particle size distributions from continuous curves of concentration changes at a given radius when an initially homogeneous suspension is spun in a disc centrifuge. The convolution integral that appears in the exact solution to the basic integral equation is substituted for by two analytical functions which allow continuous evaluation of the whole sedimentation curve. Some results are presented which show that the accuracy obtained with the simpler analytical function of the two given is comparable to that of the available numerical methods. No digital computing facility is needed since all the necessary computations can be done with an inexpensive analogue circuit and a curve follower with a minimum of operator's involvement.

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