Calculation of the effect of ice on the transmission of the James Webb Space Telescope

Jonathan Arenberg

doi:10.1117/12.736281

17 September 2007 Effects of ice on the transmission of the James Webb Space Telescope

Jonathan Arenberg

Proceedings Volume 6692, Cryogenic Optical Systems and Instruments XII; 66920S (2007) https://doi.org/10.1117/12.736281
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

The James Webb Space Telescope (JWST) has among its challenges the minimization of the effects of ice on its optical performance in terms of transmission. The ice is a result of JWST's architecture, mission design and materials selection. The optical properties of ice are introduced to illustrate why there is concern among JWST's designers about ice build up. Several alternate methods of determining the impact on mirror reflectance are compared. Two are derived from Beer's Law and the third is full thin film treatment. It is shown and argued that only the thin film method captures enough of the physics of interaction of the incident light with an ice coated mirror.

Citation Download Citation

Jonathan Arenberg "Effects of ice on the transmission of the James Webb Space Telescope", Proc. SPIE 6692, Cryogenic Optical Systems and Instruments XII, 66920S (17 September 2007); https://doi.org/10.1117/12.736281

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