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25 October 2011 Progress in the design of chromatic null screens to test cylindrical parabolic concentrators
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This paper shows the qualitative and quantitative results obtained on the test of cylindrical parabolic concentrators when the screens are designed using dot color changes to guarantee a better dot correspondence assignment and to make the optical test of the concentrator easier; the method allows to measure deformations from tenths of a millimeter to several millimeters, thus demonstrating that null screen method is good enough for testing surfaces with important deformations. On a second approximation, it is designed a null screen corresponding to the surface evaluated with the first one by fitting a fourth grade polynomial with crossed terms; with this, it is shown that the first test gets closer to the shape of the surface validating it.
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Josslyn Beltrán-Madrigal and Rufino Díaz-Uribe "Progress in the design of chromatic null screens to test cylindrical parabolic concentrators", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80111R (25 October 2011); doi: 10.1117/12.903315;

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