000006178 001__ 6178
000006178 005__ 20230126134846.0
000006178 0247_ $$2DOI$$a10.3390/s22218233
000006178 037__ $$aSCART-2023-0090
000006178 100__ $$aSchifano, L.
000006178 245__ $$aFreeform Wide Field-of-View Spaceborne Imaging Telescope: From Design to Demonstrator.
000006178 260__ $$c2022
000006178 520__ $$aWide field-of-view imaging optics offer a huge potential for space-based Earth observation enabling the capture of global data. Reflective imaging telescopes are often favored, as they do not show chromatic aberrations and are less susceptible to radiation darkening than their refractive counterparts. However, the main drawback of reflective telescopes is that they are limited with respect to field-of-view while featuring large dimensions. We propose the use of freeform optics to maximize the field of view while maintaining diffraction-limited image quality and minimizing system dimensions. In this paper, we present a novel freeform wide field-of-view reflective telescope, starting from the optical design, and continuing to tolerancing analysis and manufacture, towards a proof-of-concept demonstrator. The novel telescope features a full field-of-view of 120° while showing an exceptional spatial resolution of 2.6 km and fitting within 1 CubeSat unit. To the best of our knowledge, this is the widest field-of-view that has ever been realized for a space-based telescope, nearly reaching Earth observation from limb to limb from an altitude of about 700 km. We hope this design paves the way for future space missions enabling improved Earth observation and leading to enhanced monitoring of climate and climate change.
000006178 594__ $$aSTCE
000006178 6531_ $$awide field-of-view
000006178 6531_ $$atelescope
000006178 6531_ $$afreeform optics
000006178 6531_ $$areflective optics
000006178 6531_ $$aspace instrumentation
000006178 6531_ $$ademonstrator
000006178 6531_ $$aEarth observation
000006178 6531_ $$aclimate monitoring
000006178 700__ $$aVervaeke, M.
000006178 700__ $$aRosseel, D.
000006178 700__ $$aVerbaenen, J.
000006178 700__ $$aThienpont, H.
000006178 700__ $$aDewitte, S.
000006178 700__ $$aBerghmans, F.
000006178 700__ $$aSmeesters, L
000006178 773__ $$c8233$$pSensors$$v22(21)$$y2022
000006178 8560_ $$fsteven.dewitte@ksb-orb.be
000006178 85642 $$ahttps://www.mdpi.com/1424-8220/22/21/8233
000006178 905__ $$apublished in
000006178 980__ $$aREFERD