9 August 1988 Mirror Figure Characterization And Analysis For The Advanced X-Ray Astrophysics Facility/Technology Mirror Assembly (AXAF/TMA) X-Ray Telescope
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Abstract
The characterization of the surface of a cylindrical optic requires metrology techniques that are analogous to those for more conventional optics but much different in format. Data on the surface figure can be obtained using interferometry and a fringe scanner. We will describe how fringe scanner data is processed into optical path differences (OPDs) which give the surface profiles along a meridian of the cylinder. We will then describe how multiple meridians are combined with the azimuthal data on the circularity of the cylinder to produce a map that describes the surface figure of the optic. A set of Legendre-Fourier polynomials which are orthogonal over the surface of the cylinder are fit to the data. With the aid of these polynomials, the effects of rigid body motions (misalignments) are identified and removed and the surface figure characteristics relating to optical performance can also be derived. This procedure has been used successfully for doing optical surface metrology of two cylindrical optics which comprise the Technology Mirror Assembly (TMA), a prototype x-ray telescope assembly fabricated by Perkin-Elmer under contract to Marshall Space Flight Center (MSFC). The surface qualities of the two TMA optics are the best of any existing cylindrical optics.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrea Sarnik, Paul Glenn, "Mirror Figure Characterization And Analysis For The Advanced X-Ray Astrophysics Facility/Technology Mirror Assembly (AXAF/TMA) X-Ray Telescope", Proc. SPIE 0830, Grazing Incidence Optics for Astronomical and Laboratory Applications, (9 August 1988); doi: 10.1117/12.942158; https://doi.org/10.1117/12.942158
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