19 August 2005 Testing big roughness surfaces by using shadow moire
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Abstract
Working with big mirrors always is a great challenge, even more if the surfaces have great roughness. In this work we present a technique to verify the quality for surfaces around 3 meters in diameter and with roughness around 30 microns. In order to reach our goal we made an analysis of the grating pitch to avoid the roughness and we implement a common source light, which is independent of the angle of illumination of the surface under test. Also we implement the shadow moire and the phase shift method to obtain the wave front aberrations.
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J. Castro-Ramos, S. Vazquez-Montiel, S. Quechol-Lopez, and J. Munoz-Lopez "Testing big roughness surfaces by using shadow moire", Proc. SPIE 5869, Optical Manufacturing and Testing VI, 58691E (19 August 2005); doi: 10.1117/12.618067; https://doi.org/10.1117/12.618067
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