Abstract

A new method for the measurement of the size distribution of circular particles by using a Fraunhofer diffraction pattern is proposed, which basically consists of performing the following two steps: (1) a Hankel transform of the radial spectral intensity that is diffracted from randomly distributed circular objects and (2) a calculation of a correlation between the Hankel-transformed function and a characteristic operator, such as a digital third-derivative operator. The method provides continuous size distribution of circular objects with high resolution.

© 1983 Optical Society of America

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