Cubesat multispectral space-based imaging spectrometer enhancing climate change monitoring

Matéo Yerlès; Luca Schifano; Steven Dewitte; Hugo Thienpont; Lien Smeesters

doi:10.1117/12.3017992

17 June 2024 Cubesat multispectral space-based imaging spectrometer enhancing climate change monitoring

Matéo Yerlès, Luca Schifano, Steven Dewitte, Hugo Thienpont, Lien Smeesters

Proceedings Volume 13019, Optical Design and Engineering IX; 130190U (2024) https://doi.org/10.1117/12.3017992
Event: SPIE Optical Systems Design, 2024, Strasbourg, France

Abstract

Space-based spectrometers are of high importance for Earth observation and greenhouse gas sensing. We present a novel freeform pushbroom imaging spectrometer, covering the visible (400 – 1100 nm), near-infrared (1100 – 1700 nm) and thermal (8 – 14 μm) wavelength range, showing a full field-of-view of 120°, while fitting within a single CubeSat Unit. The design is composed of a freeform 2-mirror telescope, followed by a freeform spectrometer unit. The freeform telescope guides the light to the spectrometer entrance slit, after which a collimating mirror is present, and the light is split to the 3 spectrometer channels. Each spectrometer channel focuses the light onto a 2D detector providing both spatial and spectral information. The visible spectrometer channel comprises a transmission diffraction grating followed by 2 freeform mirrors, enabling a nadir spatial resolution of 9.87 km and a spectral resolution of 5.18 nm. The near-infrared and thermal spectrometer each comprise a reflective diffraction grating and 2 freeform mirrors, featuring a nadir spatial resolution of 4.13 km and 9.31 km, and a spectral resolution of 2.74 nm and 48.27 nm, respectively. All mirrors are described using XY polynomials, up to the 4th order, enabling a close to diffraction-limited performance. Consequently, this design might benefit future space missions enabling an improved Earth observation and climate monitoring.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Matéo Yerlès, Luca Schifano, Steven Dewitte, Hugo Thienpont, and Lien Smeesters "Cubesat multispectral space-based imaging spectrometer enhancing climate change monitoring", Proc. SPIE 13019, Optical Design and Engineering IX, 130190U (17 June 2024); https://doi.org/10.1117/12.3017992

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