Sieving Equivalent spherical diameter for the sieve method The combination of these parameters is then used to define the shape factor. Of note, the ISO standards providing guidance for performing particle size determination by static and dynamic image analysis (respectively ISO 1) recommend to define particle size by a combination of 3 primary measurements, namely the area-equivalent diameter, the maximum Feret diameter, and the minimum Feret diameter. Since the particle’s orientation at the time of image capture has a large influence on all these parameters, the equivalent spherical diameter is obtained by averaging a large number of measurements, corresponding to the different particle orientations. Enabled by the introduction of digital image analysis, this corresponds to a direct measurement of the projection area by pixel counting. The area-equivalent diameter D A, also termed circular-equivalent diameter, is the diameter of a sphere having the same projected area as the particle’s projection.In other terms, it is the length of the line dividing the projection in two areas of equal surfaces. ![]()
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