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Freeform Wide Field-of-View Spaceborne Imaging Telescope: From Design to Demonstrator.

Luca Schifano1,2, Michael Vervaeke1,3, Dries Rosseel1,3

  • 1Brussels Photonics (B-PHOT), Department of Applied Physics and Photonics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.

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Summary

This study introduces a novel freeform reflective telescope for Earth observation, achieving a record 120° field-of-view within a compact CubeSat unit. This innovation enhances global data capture and climate monitoring capabilities from space.

Keywords:
Earth observationclimate monitoringdemonstratorfreeform opticsreflective opticsspace instrumentationtelescopewide field-of-view

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Area of Science:

  • Space-based Earth observation
  • Optical engineering
  • Astrophysical instrumentation

Background:

  • Wide field-of-view imaging is crucial for global Earth observation from space.
  • Reflective telescopes are preferred for space missions due to lack of chromatic aberration and radiation resistance.
  • Traditional reflective telescopes have limitations in field-of-view and physical dimensions.

Purpose of the Study:

  • To present a novel freeform wide field-of-view reflective telescope design.
  • To maximize field-of-view while maintaining diffraction-limited image quality and minimizing system size.
  • To demonstrate a proof-of-concept for enhanced space-based Earth observation.

Main Methods:

  • Utilizing freeform optics to overcome field-of-view limitations in reflective telescopes.
  • Designing a novel telescope architecture optimized for wide-angle imaging.
  • Conducting optical design, tolerancing analysis, and manufacturing for a demonstrator.

Main Results:

  • Developed a freeform reflective telescope with a 120° full field-of-view.
  • Achieved exceptional spatial resolution of 2.6 km.
  • Integrated the telescope within a single CubeSat unit (1U).

Conclusions:

  • This design represents the widest field-of-view achieved for a space-based telescope, enabling near limb-to-limb Earth observation.
  • The compact and high-performance telescope facilitates improved Earth observation and climate change monitoring.
  • This advancement holds potential for future space missions focused on comprehensive environmental surveillance.