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Abstract

A method of ascertaining the size of small particles is disclosed. The method includes the steps of: a) intersecting at least two light beams at an intersection volume; b) sensing at each of a plurality of sensing positions angularly displaced from one another light scattered by a particle substantially in the intersection volume, and producing respective output signals indicative of the sensed light; c) ascertaining the phase difference between one of the signals and each other of the signals to give a measured indication of the variation of phase difference with angular displacement; and d) comparing the measured indication with at least one known indication of the variation of phase difference with angle for a known particle size and thereby determining the size of the particle substantially in the intersection volume.

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First Claim