Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aeam...23...38l&link_type=abstract
Aerospace America (ISSN 0740-722X), vol. 23, March 1985, p. 38-40.
Astronomy and Astrophysics
Astronomy
Computer Techniques, Hubble Space Telescope, Mirrors, Numerical Control, Polishing, High Resolution, Instrument Errors, Reflecting Telescopes, Surface Finishing, Surface Geometry, Ultraviolet Astronomy
Scientific paper
Techniques applied in perfecting a computer controlled polishing process for the Space Telescope 2.4 m reflecting mirror are outlined. The goal of UV observations using the same mirror as for optical wavelengths required a surface shape accurate to within 300 A. Interferometric measurements are performed after each polishing pass, deviations are noted, and the following pass is adjusted according to a digitized map. Constant feedback to an ongoing simulation program permits the computer control to self-calibrate its velocity, pressure and path. An epicyclic path for the brush pads assures that the target area receives the most polishing. The pad arm follows a spiral path from the center of the mirror to the outer edge to avoid polishing the same spot twice. The technology may eventually be applied on the X-ray mirror for the proposed Advanced X-ray Astrophysical Facility.
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