26 May 1998 High-resolution telescope encoder
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We describe a speckle-based, telescope-position encoder that overcomes the need the ruled scales and gratings. Using the natural surface markings to produce a speckle pattern, the system is noncontacting and simply aligned. Imaging with a CCD and computing displacements with binary correlation, sub-pixel resolution can be achieved by parabolic approximation. Results of test on the 2-meter telescope at San Pedro Martir are presented.
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Leonel Gutierrez, Carlos Dominguez-Tagle, "High-resolution telescope encoder", Proc. SPIE 3351, Telescope Control Systems III, (26 May 1998); doi: 10.1117/12.308831; https://doi.org/10.1117/12.308831

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