Shadowgram technique for recovering pupil mask alignment in the Wide Field Instrument of the Nancy Grace Roman Space Telescope

Scott O. Rohrbach; Samuel N. Nissim

doi:10.1117/12.2677613

5 October 2023 Shadowgram technique for recovering pupil mask alignment in the Wide Field Instrument of the Nancy Grace Roman Space Telescope

Scott O. Rohrbach, Samuel N. Nissim

Author Affiliations +

Proceedings Volume PC12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; PC126770F (2023) https://doi.org/10.1117/12.2677613
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The Wide Field Instrument (WFI) aboard the Nancy Grace Roman Space Telescope covers 0.48 to 2.3 um wavelength. The instrument operates at cryogenic temperatures to limit the impact of thermal self-emission (TSE) and has a pupil mask located at the WFI entrance pupil to block thermal emissions from the warmer upstream telescope components. A novel mask alignment recovery test is presented that takes advantage of the fact that the exit pupil of the front-end optics is not well formed and produces sharp shadows of the pupil mask across the detector if illuminated from individual points in the telescope entrance pupil.

Conference Presentation

Citation Download Citation

Scott O. Rohrbach and Samuel N. Nissim "Shadowgram technique for recovering pupil mask alignment in the Wide Field Instrument of the Nancy Grace Roman Space Telescope", Proc. SPIE PC12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, PC126770F (5 October 2023); https://doi.org/10.1117/12.2677613

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