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Proceedings Paper

Optic-misalignment tolerances for the POINTS interferometers
Author(s): Martin Charles Noecker; Marc A. Murison; Robert D. Reasenberg
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Paper Abstract

We present the results of two parallel studies of the sensitivity of astrometric measurements to misalignment of each of the major optical assemblies in the POINTS instrument. Tilt and displacement of the optics lead to tilt, displacement, and defocussing of the starlight and metrology beams, giving rise to systematic errors. In one method, we derive analytic expressions for the lowest order dependence of the error on the misalignment, and evaluate them in the present interferometer design. In the second method, we use a commercial numerical ray tracing program to calculate the overall optical path travelled through the misaligned starlight and metrology paths; from those results, our own software determines the dependence of the residual error on the original misalignment. These sensitivities are compared to the analytic results for mutual verification. We also discuss the impact these results have had on the design of the instrument.

Paper Details

Date Published: 10 September 1993
PDF: 14 pages
Proc. SPIE 1947, Spaceborne Interferometry, (10 September 1993); doi: 10.1117/12.155749
Show Author Affiliations
Martin Charles Noecker, Smithsonian Astrophysical Observatory (United States)
Marc A. Murison, Smithsonian Astrophysical Observatory (United States)
Robert D. Reasenberg, Smithsonian Astrophysical Observatory (United States)

Published in SPIE Proceedings Vol. 1947:
Spaceborne Interferometry
Robert D. Reasenberg, Editor(s)

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