Results from SIM's thermo-opto-mechanical (TOM3) testbed

R. Goullioud; C. A. Lindensmith; I. Hahn

doi:10.1117/12.670623

28 June 2006 Results from SIM's thermo-opto-mechanical (TOM3) testbed

R. Goullioud, C. A. Lindensmith, I. Hahn

Author Affiliations +

Proceedings Volume 6268, Advances in Stellar Interferometry; 626824 (2006) https://doi.org/10.1117/12.670623
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

Future space-based optical interferometers, such as the Space Interferometer Mission Planet Quest (SIM), require thermal stability of the optical wavefront to the level of picometers in order to produce astrometric data at the micro-arc-second level. In SIM, the internal path of the interferometer will be measured with a small metrology beam whereas the starlight fringe position is estimated from a large concentric annular beam. To achieve the micro-arc-second observation goal for SIM, it is necessary to maintain the optical path difference between the central and the outer annulus portions of the wavefront of the front-end telescope optics to a few tens of picometers. The Thermo-Opto-Mechanical testbed (TOM3) was developed at the Jet Propulsion Laboratory to measure thermally induced optical deformations of a full-size flight-like beam compressor and siderostat, the two largest optics on SIM, in flight-like thermal environments. A Common Path Heterodyne Interferometer (COPHI) developed at JPL was used for the fine optical path difference measurement as the metrology sensor. The system was integrated inside a large vacuum chamber in order to mitigate the atmospheric and thermal disturbances. The siderostat was installed in a temperature-controlled thermal shroud inside the vacuum chamber, creating a flight-like thermal environment. Detailed thermal and structural models of the test articles (siderostat and compressor) were also developed for model prediction and correlation of the thermal deformations. Experimental data shows SIM required thermal stability of the test articles and good agreement with the model predictions.

Citation Download Citation

R. Goullioud, C. A. Lindensmith, and I. Hahn "Results from SIM's thermo-opto-mechanical (TOM3) testbed", Proc. SPIE 6268, Advances in Stellar Interferometry, 626824 (28 June 2006); https://doi.org/10.1117/12.670623

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