Straylight analysis of the Next-Generation Space Telescope

Details Straylight analysis of the Next-Generation Space Telescope Straylight analysis of the Next-Generation Space Telescope

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3356..153b&link_type=abstract

Proc. SPIE Vol. 3356, p. 153-160, Space Telescopes and Instruments V, Pierre Y. Bely; James B. Breckinridge; Eds.

Physics

Optics

Scientific paper

Current concepts for the NGST call for an 'open' telescope design in order to passively cool the telescope and instrument to cryogenic temperatures. We show that, in spite of the lack of an external baffle, straylight due to off- axis sources is negligible compared to the zodiac light. We also show that the instrumental thermal emission is in general dominated by scatter from the sunshield and not by emission from the optics. The back surface of the sunshield needs to be at about 180 K or less to reduce the self emission of the observatory to a negligible level in the near-IR, and at about 90 K or less in the case of the mid- IR.

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