17 January 2008 Mid-frequency surface error test with a Foucault apparatus
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Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 67230A (2008) https://doi.org/10.1117/12.782715
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China
Abstract
Testing of mid-frequency surface error is of the first importance for fast optics, especially for large aperture aspherics. Foucault test plays a dominant role for surface error inspection before the digital interferometer age, but it seems to have faded out these days because no quantitative results turn out. However, an interferometer with high resolution CCDs is either unavailable or unaccessible in the process of manufacture. As its advantages are realized and recognized for the second time, Foucault test is going back to the stage again. A new theory of calculating the contrast of the shadow pattern of Foucault test is put forward in this paper and some modifications are discussed upon the analyses of the limitation of traditional Foucault apparatus. A paraboloidal mirror was fabricated and tested by the modified Foucault apparatus whose effect has been proved to be great. The methods of controlling mid-frequency error are described in the other paper at this conference- "Multi-mode combine manufacturing technology for large aperture aspheric mirrors"1.
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Bin Xuan, Junfeng Li, Shumei Song, Jingjiang Xie, "Mid-frequency surface error test with a Foucault apparatus", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67230A (17 January 2008); doi: 10.1117/12.782715; https://doi.org/10.1117/12.782715
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