| タイトル | Optical Coating Performance and Thermal Structure Design for Heat Reflectors of JWST Electronic Control Unit |
| 著者（英） | Rashford, Robert; Garrison, Matt; Quijada, Manuel A.; Threat, Felix; Bousquet, Robert; Perrygo, Chuck |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2008-06-23 |
| 言語 | eng |
| 内容記述 | The James Webb Space Telescope (JWST) consists of an infrared-optimized Optical Telescope Element (OTE) that is cooled down to 40 degrees Kelvin. A second adjacent component to the OTE is the Integrated Science Instrument Module, or ISIM. This module includes the electronic compartment, which provides the mounting surfaces and ambient thermally controlled environment for the instrument control electronics. Dissipating the 200 watts generated from the ISIM structure away from the OTE is of paramount importance so that the spacecraft's own heat does not interfere with the infrared light detected from distant cosmic sources. This technical challenge is overcome by a thermal subsystem unit that provides passive cooling to the ISIM control electronics. The proposed design of this thermal radiator consists of a lightweight structure made out of composite materials and low-emittance metal coatings. In this paper, we will present characterizations of the coating emittance, bidirectional reflectance, and mechanical structure design that will affect the performance of this passive cooling system. |
| NASA分類 | Mechanical Engineering |
| 権利 | No Copyright |
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