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Deposition Sciences Inc. - Difficult Coatings - LB - 8/23

Microstepping Improves Ronchigrams

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A team from the Universitat Politècnica de Catalunya in Terrassa, Spain, has developed a Ronchi test that increases the number of sampling points in a ronchigram and offers higher accuracy without increasing diffraction effects. In an experiment that they described in the Sept. 1 issue of Applied Optics, the researchers profiled a 1.76-sq-cm spherical surface with 7583 sampling points using the new technique. The standard test offers 72 sampling points for a 2.04-sq-cm spherical surface. The improved test, which the researchers call microstepping, superimposes multiple...Read full article

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    Published: December 2000
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