Physics – Optics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1618...97b&link_type=abstract
Proc. SPIE Vol. 1618, p. 97-103, Large Optics II, Robert E. Parks; Ed.
Physics
Optics
Scientific paper
A ten meter astronomical telescope is being constructed using a phased array of two meter segments. This requires manufacture of a large number of off-axis segments and emphasizes the desirability of rapid manufacture and smoothness of finish of the segments. These two requirements have been met at Itek by combining surface figure measurement of a mirror using a multiple probe mechanical bar profilometer and fabrication of that mirror by stressed mirror polishing. Through the use of the multiple probe bar profilometer, a mirror segment can be measured to an accuracy of 0.047 microns rms surface error in a period of less than 90 minutes, including data processing time. This test has allowed us to manufacture 12 off-axis segments with a final surface error, after low-order correction by the in-use mount, of approximately .02 microns rms. The average rate for the entire grind and polish fabrication cycle is six weeks per mirror.
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