Presentation + Paper
4 October 2023 Reflective engineered diffusers on the Roman Space Telescope Wide Field Instrument
Benjamin Cromey, Eric H. Frater, Timothy Finch, Genaro Montoya, Raymond Wright, Gregory D. Wirth, Derek Sabatke, Thomas Delker
Author Affiliations +
Abstract
NASA’s Roman Space Telescope’s Wide Field Instrument mosaic detector array of 18 H4RG-10 chips requires regular and uncommonly accurate calibrations to meet its science objectives. In addition to the quasi-Lambertian diffuser used for detector flat-fielding, a novel engineered diffuser is incorporated as part of seven cold stop masks on the science bandpass filters. These engineered diffusers are used to illuminate the focal plane concurrently with an exposure from the observatory, enabling signal-dependent nonlinearity corrections. This presentation demonstrates via experimental data how these diffusers can produce a spatially uniform and smooth illumination profile with increased flux compared to a Lambertian diffuser.
Conference Presentation
© (2023) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Benjamin Cromey, Eric H. Frater, Timothy Finch, Genaro Montoya, Raymond Wright, Gregory D. Wirth, Derek Sabatke, and Thomas Delker "Reflective engineered diffusers on the Roman Space Telescope Wide Field Instrument", Proc. SPIE 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, 1267703 (4 October 2023); https://doi.org/10.1117/12.2674196
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Diffusers

Coating

Light sources and illumination

Equipment

Calibration

Optical surfaces

Reflection

Back to Top