Features of the interference field in a diffraction interferometer for surface testing |
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| Authors: | V P Koronkevich G A Lenkova |
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| Institution: | (1) Institute of Automation and Electrometry, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia |
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| Abstract: | The interference field in an interferometer with a zone plate set at the center of curvature of a tested mirror has been investigated. The conditions for testing spherical and parabolic surfaces have been determined. It has been shown that the zero-fringe tracing method allows imperfections in the mirror shape to be distinguished from the instrumental error of the interferometer. The results of testing a parabolic surface are compared with measurements by the Ritchey method. The deviations between the mean asphericity values did not exceed λ/20. |
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