19 May 2003 Automated figuring and polishing of replication mandrels for X-Ray telescopes
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Abstract
In support of the Constellation X mission the Optics Branch at Goddard Space Flight Center is developing technology for precision figuring and polishing of mandrels used to produce replicated mirrors that will be used in X-Ray telescopes. Employing a specially built machine controlled in 2 axes by a computer, we are doing automated polishing/figuring of 15 cm long, 20 cm diameter cylindrical, conical and Wolter mandrels. A battery of tests allow us to fully characterize all important aspects of the mandrels, including surface figure and finish, mid-frequency errors, diameters and cone angle. Parts are currently being produced with surface roughnesses at the 0.4nm RMS level, and half-power diameter 0.6 arcseconds.
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Geraldine Wright, "Automated figuring and polishing of replication mandrels for X-Ray telescopes", Proc. SPIE 10314, Optifab 2003: Technical Digest, 1031409 (19 May 2003); doi: 10.1117/12.2283998; https://doi.org/10.1117/12.2283998
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