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Proceedings Paper

AXAF-I alignment test system autocollimating flat error correction
Author(s): Timothy S. Lewis
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Paper Abstract

The alignment test system for the AXAF-I high-resolution mirror assembly (HRMA) performs a double-pass Hartmann test, in which a beam of light emitted from the focus of the HRMA is reflected back through the HRMA by an autocollimating flat (ACF). Measurements of the displacement of the beam on its return to the focal plane can be used to determine the misalignment of the HRMA, and also some information about errors in the shapes of the HRMA mirrors. Beam displacements caused by imperfections in the ACF can be distinguished from those caused by the HRMA by taking measurements with the ACF in different positions. This paper shows how to use such measurements to calibrate the system to compensate for errors caused by the ACF. Simulated results based on measured ACF surface data are presented.

Paper Details

Date Published: 20 June 1995
PDF: 12 pages
Proc. SPIE 2515, X-Ray and Extreme Ultraviolet Optics, (20 June 1995); doi: 10.1117/12.212600
Show Author Affiliations
Timothy S. Lewis, Eastman Kodak Co. (United States)

Published in SPIE Proceedings Vol. 2515:
X-Ray and Extreme Ultraviolet Optics
Richard B. Hoover; Arthur B. C. Walker Jr., Editor(s)

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