High-resolution telescope encoder

Details High-resolution telescope encoder High-resolution telescope encoder

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3351..440g&link_type=abstract

Proc. SPIE Vol. 3351, p. 440-447, Telescope Control Systems III, Hilton Lewis; Ed.

Computer Science

Scientific paper

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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