Predictive Thermal Control (PTC) Technology to Enable Thermally Stable Telescopes: First Two Year Status

Stahl, H Philip ; Brooks, Thomas E

关键词: PREDICTIONS;    TEMPERATURE CONTROL;    THERMAL STABILITY;    THERMAL EXPANSION;    MIRRORS;    HABEX;    ULTRAVIOLET TELESCOPES;    INFRARED TELESCOPES;    SPACEBORNE TELESCOPES;    TECHNOLOGY ASSESSMENT;    EXTRASOLAR PLANETS;    HABITABILITY;    MISSION PLANNING;   

RP-ID  :  MSFC-E-DAA-TN69844

学科分类：原子、分子光学和等离子物理

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

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-thermally-stable 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 (Structural, Thermal, and Optical Performance) model of the AMTD-2 (Advance Mirror Technology Development) 1.5-meter 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-meter enclosure with 26 actively-control thermal zones; and defined specifications for a potential 4-meter primary mirror thermal enclosure for the Habitable Exoplanet (HabEx) Imager mission.