Predictive thermal control (PTC) technology to enable thermally stable telescopes: first two year status

H. Philip Stahl; Thomas E. Brooks

doi:10.1117/12.2530117

9 September 2019 Predictive thermal control (PTC) technology to enable thermally stable telescopes: first two year status

H. Philip Stahl, Thomas E. Brooks

Author Affiliations +

Proceedings Volume 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II; 111160U (2019) https://doi.org/10.1117/12.2530117
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The Predictive Thermal Control Technology (PTCT) development project is a multiyear effort initiated in Fiscal Year (FY) 2017, to mature the Technology Readiness Level (TRL) of critical technologies required to enable ultra-thermallystable ultraviolet/optical/infrared (UVOIR) space telescope primary-mirror assemblies for ultra-high-contrast observations of exoplanets. Key accomplishments of 2017 to 2019 include: creating a high-fidelity STOP model of the AMTD-2 1.5-m Ultra-Low Expansion (ULE®) mirror (manufactured by Harris Corp) by merging 3D X-Ray computed tomography data of the ‘as-built’ mirror and coefficient of thermal expansion (CTE) data maps for each of the 18 core elements; partially validating this model by measuring the mirror’s response to bulk temperature changes and lateral thermal gradients; designed and built (with PTC partner Harris Corp) a 1.5-m enclosure with 26 actively-control thermal zones; and defined specifications for a potential 4-m primary mirror thermal enclosure for the Habitable Exoplanet (HabEx) Imager mission.

Conference Presentation

Citation Download Citation

H. Philip Stahl and Thomas E. Brooks "Predictive thermal control (PTC) technology to enable thermally stable telescopes: first two year status", Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160U (9 September 2019); https://doi.org/10.1117/12.2530117

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