000006179 001__ 6179
000006179 005__ 20230126134856.0
000006179 0247_ $$2DOI$$a10.1117/12.2622144
000006179 037__ $$aSCART-2023-0091
000006179 100__ $$aSchifano, L.
000006179 245__ $$aTowards a demonstrator setup for a wide-field-of-view visible to near-infrared camera aiming to characterize the solar radiation reflected by the Earth.
000006179 260__ $$c2022
000006179 520__ $$aClimate change monitoring is still a major challenge, which is currently typically addressed using radiometers monitoring the radiative fluxes at the top of the atmosphere. To improve the current state-of-the-art monitoring instruments, we pursue the development of novel space instrumentation, combining a radiometer with two additional imagers, improving the spatial resolution to a few kilometers allowing scene identification, while enabling a spectral distinction between the reflected solar radiation (RSR) using a visible to near-infrared (400 – 1100 nm) camera, and the Earth’s emitted thermal radiation using a thermal infrared (8 – 14 μm) camera. In this paper, we present a novel camera design optimized towards RSR monitoring, while targeting a compact design and minimizing the number of aspheric components. More specifically, our optimized imaging design shows a wide field of view (138°) enabling to observe the Earth from limb to limb, a compact volume fitting within 1 CubeSat Unit (1U), a wide spectral range (400 – 900 nm) to retrieve the RSR with a certainty of more than 95%, a spatial resolution better than 5 km at nadir, and a close to diffraction-limited performance. After optimization towards the nominal design, possible design alternatives are considered and discussed, enabling a cost-efficient design choice. Following, the mechanical and optical design tolerances are evaluated using a statistical Monte Carlo analysis, indicating a robust and tolerant design that can be manufactured using ultra-precision diamond tooling. Finally, stray-light analysis was performed enabling evaluation of ghost reflection and evaluating the necessity of an anti-reflection coating. Consequently, we can conclude our proposed imaging designs show a promising performance optimized towards Earth observation, paving the way to an improved climate change monitoring. 
000006179 594__ $$aSTCE
000006179 700__ $$aDuerr, F.
000006179 700__ $$aBerghmans, F.
000006179 700__ $$aDewitte, S.
000006179 700__ $$aSmeesters, L.
000006179 773__ $$c111-120$$pSPIE Optics, Photonics and Digital Technologies for Imaging Applications VII$$v12138$$y2022
000006179 8560_ $$fsteven.dewitte@ksb-orb.be
000006179 85642 $$ahttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/12138/121380H/Towards-a-demonstrator-setup-for-a-wide-field-of-view/10.1117/12.2622144.short?SSO=1
000006179 905__ $$apublished in
000006179 980__ $$aNONREF