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Proceedings Paper

Segmented Mirror, Manufacturing And Alignment Tolerances (SMMAT)
Author(s): P. K. Manhart; J. Michael Rodgers
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Paper Abstract

To better understand the relationship between active, segmented precision reflectors and manufacturing and alignment errors, a FORTRAN routine has been written for the Precision Segmented Reflector (PSR) and Large Deployable Reflector (LDR) programs that simulates these errors and provides optical path difference (OPD ) input for CODE V TM through the 'ADD' option in the pupil map and point spread function features. Diffraction analysis,including point spread function and encircled energy can then be performed. The manufacturing errors are input for each segment in terms of 37 Zernike terms whose origin is the segment's center. Alignment errors are input for each segment in terms of the six degrees of freedom, dx, dy,dz, α,β, γ. Angles are defined with respect to the segments center. The program works in two modes. The first mode simply looks at the effects that the errors have on image quality without any compensating parameters. The second mode uses three degrees of freedom to help compensate for the effects of the other errors. In this mode, dz, α and β are used to minimize the sag difference between the real and ideal parabolic surface to insure proper phasing of all mirror segments. This paper discusses the methodology and results of this endeavor.

Paper Details

Date Published: 20 September 1989
PDF: 19 pages
Proc. SPIE 1114, Active Telescope Systems, (20 September 1989); doi: 10.1117/12.960843
Show Author Affiliations
P. K. Manhart, California Institute of Technology (United States)
J. Michael Rodgers, Optical Research Associates (United States)

Published in SPIE Proceedings Vol. 1114:
Active Telescope Systems
Francois J. Roddier, Editor(s)

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