Optical coating performance for heat reflectors of JWST-ISIM electronic component

Manuel A. Quijada; Robert Bousquet; Matt Garrison; Chuck Perrygo; Felix Threat; Robert Rashford

doi:10.1117/12.790521

12 July 2008 Optical coating performance for heat reflectors of JWST-ISIM electronic component

Manuel A. Quijada, Robert Bousquet, Matt Garrison, Chuck Perrygo, Felix Threat, Robert Rashford

Proceedings Volume 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter; 70103G (2008) https://doi.org/10.1117/12.790521
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

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 reflector.

Citation Download Citation

Manuel A. Quijada, Robert Bousquet, Matt Garrison, Chuck Perrygo, Felix Threat, and Robert Rashford "Optical coating performance for heat reflectors of JWST-ISIM electronic component", Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70103G (12 July 2008); https://doi.org/10.1117/12.790521

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KEYWORDS

Reflectivity

Reflectors

Composites

Bidirectional reflectance transmission function

James Webb Space Telescope

Gold

Infrared radiation

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