Segmented Mirror, Manufacturing And Alignment Tolerances (SMMAT)

P. K. Manhart; J. Michael Rodgers

doi:10.1117/12.960843

20 September 1989 Segmented Mirror, Manufacturing And Alignment Tolerances (SMMAT)

P. K. Manhart, J. Michael Rodgers

Proceedings Volume 1114, Active Telescope Systems; (1989) https://doi.org/10.1117/12.960843
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

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.

Citation Download Citation

P. K. Manhart and J. Michael Rodgers "Segmented Mirror, Manufacturing And Alignment Tolerances (SMMAT)", Proc. SPIE 1114, Active Telescope Systems, (20 September 1989); https://doi.org/10.1117/12.960843

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