26 June 2017 Improvement of the method of optical testing of fast aspherical surfaces with null-screens
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We extend the principles of the null-screen method for testing fast aspheric surfaces with polynomial expansion. We present the formulae to design the null-screen in such a way that the image on the CCD is a perfect array circular points; the departures of the surface from a perfect shape are observed as deformations of the array in the image. For the testing of fast aspherics with polynomial expansion, we propose some geometrical configurations. In addition, we perform an analysis of the deformations of the image of the null-screen reflected by the testing surface due to the slop defects of the surface. Experimental results for the testing fast aspherics are shown. The main advantages and the limitations of the method will be discussed.
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Manuel Campos-García, Manuel Campos-García, Daniel Aguirre Aguirre, Daniel Aguirre Aguirre, Victor de Emanuel Armengol-Cruz, Victor de Emanuel Armengol-Cruz, "Improvement of the method of optical testing of fast aspherical surfaces with null-screens", Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 103301V (26 June 2017); doi: 10.1117/12.2271676; https://doi.org/10.1117/12.2271676

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