Statistics – Applications
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..228...41g&link_type=abstract
In: Active optical devices and applications; Proceedings of the Seminar, Washington, DC, April 10, 11, 1980. (A81-37719 17-74) B
Statistics
Applications
Mirrors, Numerical Control, Spaceborne Telescopes, Surface Finishing, Algorithms, Asphericity, Data Reduction, Infrared Telescopes, Interferometry, Polishing, Profilometers, Surface Properties
Scientific paper
A computer-controlled optical surfacing system being developed under the HALO (High Altitude Large Optics) Technology Program for rapid surfacing of very large lightweight highly aspheric mirrors of infrared quality is discussed. It is noted that although the full fabrication sequence with a severe aspheric has not yet been completed, the experiments so far completed indicate that the process operates in the intended manner. Semiautomated measurement with the profilometer bar in the grinding phase has been found to be sufficient in preparing the surface for interferometry and polishing. With the profilometer bar, sags of separate pieces can be matched to 0.1 micron. It is pointed out that the measuring machine under development promises to improve the surface measurement accuracy in the grinding phase even further and may eventually be able to perform some or all of the figuring measurements now made with center-of-curvature interferometry, eliminating problems associated with aspherics and convex surfaces.
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