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27 September 1979 Test And Evaluation Of A 60-Inch Test Mirror
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Proceedings Volume 0183, Space Optics II; (1979)
Event: 1979 Huntsville Technical Symposium, 1979, Huntsville, United States
A facility for interferometric test and evaluation of large mirrors has been developed to aid in the fabrication of a 60- inch diameter f/2.3 hyperboloid. Testing takes place in a test chamber which provides vibration isolation and thermal stabili ty in a clean room environment. The uncoated mirror is floated on a calibrated metrology mount located upon a six-degree-of-freedom table used to align and orient the mirror to a fixed geometry metrology unit. The metrology unit consists of a Co-axial Reference Interferometer (CORI) and a reflective null corrector which produces interferograms in the form of photographic negatives. Interferograms of this concave hyperboloidal primary mirror are evaluated in the Interferogram Analysis Facility (IAF) which employs a scanning microdensitometer, and fringe extraction and analysis software specially developed for high performance applications. The IAF routinely provides surface figure analyses in the form of contour and aberration data. This includes multiple measurement statistics as well as aberration calculations based on polynomials orthonormalized over an annulus.
© (1979) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Montagnino, R. Arnold, D. Chadwick, L. Grey, and G. Rogers "Test And Evaluation Of A 60-Inch Test Mirror", Proc. SPIE 0183, Space Optics II, (27 September 1979);

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