CubeSpec: LED-based calibration system

Job Schuermans; Gert Raskin; Dominic Bowman; Jeroen De Maeyer; Maarten Kempenaers; Jacob Pember; Pierre Royer; Hugues Sana; Christian Schwab; Bart Vandenbussche

doi:10.1117/12.2630366

27 August 2022 CubeSpec: LED-based calibration system

Job Schuermans, Gert Raskin, Dominic Bowman, Jeroen De Maeyer, Maarten Kempenaers, Jacob Pember, Pierre Royer, Hugues Sana, Christian Schwab, Bart Vandenbussche

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218030 (2022) https://doi.org/10.1117/12.2630366
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

CubeSpec is an in-orbit CubeSat mission aiming to demonstrate high-spectral-resolution astronomical spectroscopy with a 10 × 20cm² aperture telescope. A robust calibration system is crucial for CubeSpec’s spectrograph to operate reliably and autonomously. Typically, flat-field illumination defines order locations, while a line source ties wavelength values to detector pixels. The main challenge is to fit everything into a 10 × 10 × 20cm³ volume without forfeiting quality and control. This work proposes Calibration Unit for CUbespec (CUCU). CUCU offers a compact, energy-efficient calibration solution for space-borne spectrograph platforms, miniaturizing both calibration stages. A blue and white LED coupled into one fiber produce the continuum light source, spanning the spectrograph’s operational range of 420nm to 620nm. The line standards emerge from injecting collimated LED light into a solid Fabry-P´erot etalon. To satisfy the mission requirements, CUCU should deliver calibration exposures with an SNR of 200. Throughput measurements estimate calibration exposures to take no longer than 0.5s.

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Job Schuermans, Gert Raskin, Dominic Bowman, Jeroen De Maeyer, Maarten Kempenaers, Jacob Pember, Pierre Royer, Hugues Sana, Christian Schwab, and Bart Vandenbussche "CubeSpec: LED-based calibration system", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218030 (27 August 2022); https://doi.org/10.1117/12.2630366

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