Technical sieves are employed by a number of industries. The distribution of their aperture (hole) sizes must conform strict standards (ISO, ANSI etc) for their certification. We built a visual inspection system of sieves which is able to measure thousands of apertures and wire diameter in a matter of minutes and compute their distribution. The system consists of an xy table under a set of three cameras with different field of views, able to inspect sieves in the range of 0.5 cm to 40 $\mu$m of nominal aperture.
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Joan Serrat, Albert Pujol