Design of an imaging spectrometer for earth observation using freeform mirrors

Peschel, Thomas; Damm, Christoph; Beier, Matthias; Gebhardt, Andreas; Risse, Stefan; Walter, Ingo; Sebastian, Ilse; Krutz, David

doi:10.1117/12.2296156

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…The Offner mirror and TMA mirrors are manufactured by Single-Point Diamant Turning (SPDT), using Subsequent Magneto-Rheological Finishing (MRF), and a post-polishing process. The mirrors M1 and M3 of the TMA [19] are located on a common base substrate structure. They share a common vertex and have been grinded in one work stage that simplified the manufacturing and alignment process of the TMA.…”

Section: Desis Designmentioning

confidence: 99%

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The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Krutz¹,

Müller²,

Knodt

et al. 2019

Sensors

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Whether for identification and characterization of materials or for monitoring of theenvironment, space-based hyperspectral instruments are very useful. Hyperspectral instrumentsmeasure several dozens up to hundreds of spectral bands. These data help to reconstruct the spectralproperties like reflectance or emission of Earth surface or the absorption of the atmosphere, and toidentify constituents on land, water, and in the atmosphere. There are a lot of possible applications,from vegetation and water quality up to greenhouse gas monitoring. But the actual number ofhyperspectral space-based missions or hyperspectral space-based data is limited. This will be changedin the next years by different missions. The German Aerospace Center (DLR) Earth Sensing ImagingSpectrometer (DESIS) is one of the new currently existing space-based hyperspectral instruments,launched in 2018 and ready to reduce the gap of space-born hyperspectral data. The instrument isoperating onboard the International Space Station, using the Multi-User System for Earth Sensing(MUSES) platform. The instrument has 235 spectral bands in the wavelength range from visible(400 nm) to near-infrared (1000 nm), which results in a 2.5 nm spectral sampling distance and aground sampling distance of 30 m from 400 km orbit of the International Space Station. In this article,the design of the instrument will be described.

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Section: Desis Designmentioning

confidence: 99%

“…Cut-view of the DESIS opto-mechanical system. The Three-Mirror-Anastigmat (TMA) is on left side, and the spectrometer is on the right [19]. …”

Section: Figurementioning

confidence: 99%

The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Krutz¹,

Müller²,

Knodt

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…The optical as well as the mechanical design of the optical system were described in an earlier paper [2] : The telescope is a compact, fast Three-Mirror-Anastigmat (TMA) with a focal length of 320 mm and an aperture of F/2.8, which images the surface of the earth onto a slit. The spectrometer relies on a modified Offner type [3] design.…”

Section: Icso 2018 International Conference On Space Opticsmentioning

confidence: 99%

Integration and testing of an imaging spectrometer for earth observation

Peschel

Beier

Damm

et al. 2019

International Conference on Space Optics — ICSO 2018

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The DLR Earth Sensing Imaging Spectrometer (DESIS) is a space-based hyperspectral instrument developed by Deutsches Zentrum für Luft-und Raumfahrt (DLR). The optical system of the spectrometer was fabricated and prealigned by the Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF).The paper describes the manufacturing, integration, and testing of this optical system. It was realized as an all reflective system using metal-based mirrors and a modular, so-called snap-together approach, which allows to simplify the integration of optical systems considerably. Measured r.m.s. wavefront errors of the complete system are in the range of 63 nm to 120 nm, which is compliant with the instrument's requirements.

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“…The housings are optimized by means of light weighting, accuracy, and stiffness. The structures include all alignment interfaces for the mirror mounting, following the snap-together concept [12,25,27].…”

Section: Electroless Nipmentioning

confidence: 99%

Stray light reduction of silicon particle reinforced aluminum for optical systems

Kinast

Telle

Schröder

et al. 2019

International Conference on Space Optics — ICSO 2018

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Silicon particle reinforced aluminum containing 42 wt.% silicon (Al-42Si) offers higher specific stiffness, higher resistance to thermal gradients, and an athermal behavior combined with electroless nickel, in comparison to state-of-theart aluminum alloys (e.g. Al6061). Nevertheless, typical surface modifications (e.g. black anodization) lead to a nonsufficient optical stray light suppression due to the high amount of silicon particles on the surface. Therefore, a coating technique is required that fulfils the optical and the mechanical (e.g. adhesive strength) specifications for stray light reduction on Al-42Si. Different components like housings and barrels made of Al-42Si were coated with amorphous NiP and with Fractal Black™ by Acktar Ltd. The optical performance is analyzed by angle-resolved light scattering (ARS) at two different wavelengths (532 nm and 1064 nm). Fractal Black™ offers a total scattering level of lower than 2 % at 532 nm and 1064 nm. Fractal Black™ has been proven as a suitable coating for components made of Al-42Si.

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Design of an imaging spectrometer for earth observation using freeform mirrors

Cited by 8 publications

References 8 publications

The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS)

The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Integration and testing of an imaging spectrometer for earth observation

Stray light reduction of silicon particle reinforced aluminum for optical systems

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