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Proceedings Paper

M1 mirror print-thu investigation and performance on the thermo-opto-mechanical testbed for the Space Interferometry Mission
Author(s): V. Alfonso Feria; Jonathan Lam; Dave Van Buren
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Paper Abstract

SIM PlanetQuest (SIM) is a large (9-meter baseline) space-borne optical interferometer that will determine the position and distance of stars to high accuracy. With microarcsecond measurements SIM will probe nearby stars for Earth-sized planets. To achieve this precision, SIM requires very tight manufacturing tolerances and high stability of optical components. To reduce technical risks, the SIM project developed an integrated thermal, mechanical and optical testbed (TOM3) to allow predictions of the system performance at the required high precision. The TOM3 testbed used full-scale brassboard optical components and picometer-class metrology to reach the SIM target performance levels. During the testbed integration and after one of the testbed mirrors, M1, was bonded into its mount, some surface distortion dimples that exceeded the optical specification were discovered. A detailed finite element model was used to analyze different load cases to try to determine the source of the M1 surface deformations. The same model was also used to compare with actual deformations due to varied thermal conditions on the TOM3 testbed. This paper presents the studies carried out to determine the source of the surface distortions on the M1 mirror as well as comparison and model validation during testing. This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

Paper Details

Date Published: 6 July 2006
PDF: 9 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62731C (6 July 2006); doi: 10.1117/12.671612
Show Author Affiliations
V. Alfonso Feria, Jet Propulsion Lab. (United States)
Jonathan Lam, Jet Propulsion Lab. (United States)
Dave Van Buren, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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