Dr. Henrik von Lukowicz Profile

Dr. Henrik von Lukowicz

at Fraunhofer IOF

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 9 May 2024 Presentation + Paper

Development of an auxetic mounting structure for refractive optical systems

Johannes Frasch, Henrik von Lukowicz, Stefan Risse

Proceedings Volume 12946, 129460I (2024) https://doi.org/10.1117/12.3010415

KEYWORDS: Finite element methods, Athermalization, Thermal deformation, Design, Optical mounts, Deformation, Optical components, Telescopes, Optical design

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In high-precision refractive optical systems, e.g. telescopes and spectrometers for space applications, temperature differences in influence the optical performance in the form of aberrations, especially thermal defocus. By temperature changes not only the radii of the optical elements itself, but also the distances between the optical elements are changing in dependency of the used mount materials. This causes a thermal defocus of the system and needs to be compensated. There are multiple approaches for compensation, generally divided into active and passive compensation. Active compensation techniques, e.g. piezo actuators, are highly accurate but require a control system, which is a cost and complexity driver. Passive compensation techniques often use combinations of several materials with different coeffcients of thermal expansion. This increases the overall complexity and mass. The focus of this research is to develop a mechanical structure that passively compensates for thermal defocus over a wide temperature range. Auxetic unit cells are the basis of this structure. Auxetic structures exhibit a negative Poisson´s ratio. By three-dimensional combination of auxetic unit cells, these can be arranged in a way that a transformation from radial deformation into longitudinal deformation is realized. The geometrical complexity requires additive manufacturing as manufacturing process. This concept is used to develop a mounting structure that passively compensates for thermal defocus by opposing longitudinal deformation, which is triggered by the thermally induced radial deformation of the structure itself under temperature changes. By analytical and numerical investigations, the mechanical behavior of the auxetic cells is studied in dependency of geometrical parameters. With these results, an auxetic mounting structure is developed. The aim is to compensate 5 μmK^-1 axial spacing over a temperature range of 80 K. For proof of concept, a demonstrator system is numerically investigated under thermal loads and on its structural-dynamic properties.

Proceedings Article | 12 July 2023 Open Access

Miniature three-mirror telescope for the thermal infrared

Thomas Peschel, Henrik von Lukowicz, Lucas Zettlitzer, Johannes Hartung, Stefan Risse, Matthias Beier, Marius Bierdel, Max Gulde

Proceedings Volume 12777, 127772Y (2023) https://doi.org/10.1117/12.2690313

KEYWORDS: Telescopes, Mirrors, Design and modelling, Thermography, Manufacturing, Infrared telescopes, Infrared radiation, Astronomical imaging, Tolerancing, Mirror surfaces

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Proceedings Article | 30 September 2022 Paper

CO2Image: the design of an imaging spectrometer for CO2 point source quantification

David Krutz, Ingo Walter, Ilse Sebastian, Carsten Paproth, Thomas Peschel, Christoph Damm, Stefan Risse, Henrik von Lukowicz, Anke Roiger, Andre Butz, Claas Köhler

Proceedings Volume 12233, 1223306 (2022) https://doi.org/10.1117/12.2635250

KEYWORDS: Spectroscopy, Sensors, Carbon dioxide, Mirrors, Optical design, Radio optics, Space operations, Signal to noise ratio, Imaging systems, Aerospace engineering

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Proceedings Article | 27 August 2022 Presentation + Paper

Development and manufacturing of the receiver telescope for the Ganymede Laser Altimeter (GALA)

Henrik von Lukowicz, Johannes Hartung, Robert Jende, Sandra Müller, Mathias Rohde, Jan Kinast, Knut Kleinbauer, Svetlana Shestaeva, Stefan Schwinde, Thomas Peschel, Kai Weidlich, Henry Wegert, Stefan Risse

Proceedings Volume 12180, 121800H (2022) https://doi.org/10.1117/12.2631688

KEYWORDS: Mirrors, Telescopes, Manufacturing, Interfaces, Diamond turning, Coating, Reflectivity, Receivers, Optics manufacturing, Jupiter

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Proceedings Article | 11 June 2021 Open Access

The high precision double slit device of the slit assembly for the FLEX instrument

Matthias Mohaupt, Uwe Zeitner, Gerd Harnisch, Thomas Bolz, Stefan Risse, Andreas Gebhardt, Henrik von Lukowicz, Thomas Peschel, Uwe Hübner, Yann Gerome, Markus Erhard, Gehard Huber

Proceedings Volume 11852, 118520K (2021) https://doi.org/10.1117/12.2599166

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Proceedings Article | 11 June 2021 Open Access

Au coatings for spaced based reflectors

Stefan Schwinde, Svetlana Shestaeva, Sven Stempfhuber, Henrik von Lukowicz, Jochen Kuhnhenn, Sven Schröder

Proceedings Volume 11852, 118521Q (2021) https://doi.org/10.1117/12.2599299

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Proceedings Article | 11 June 2021 Open Access

Optimization and additive manufacturing of a three-mirror-anastigmatic telescope

Henrik von Lukowicz, Johannes Hartung, Enrico Hilpert, Christoph Damm, Thomas Peschel, Nils Heidler

Proceedings Volume 11852, 1185206 (2021) https://doi.org/10.1117/12.2599146

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SPIE Journal Paper | 9 May 2019 Open Access

Design, additive manufacturing, processing, and characterization of metal mirror made of aluminum silicon alloy for space applications

Enrico Hilpert, Johannes Hartung, Henrik von Lukowicz, Tobias Herffurth, Nils Heidler

OE, Vol. 58, Issue 09, 092613, (May 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.9.092613

KEYWORDS: Mirrors, Foam, Additive manufacturing, Aluminum, Metals, Optics manufacturing, Silicon, Light scattering, Computer aided design, Diamond turning

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Proceedings Article | 15 June 2018 Paper

Additive manufacturing of metal mirrors for TMA telescope

Nils Heidler, Enrico Hilpert, Johannes Hartung, Henrik von Lukowicz, Christoph Damm, Thomas Peschel, Stefan Risse

Proceedings Volume 10692, 106920C (2018) https://doi.org/10.1117/12.2316343

KEYWORDS: Mirrors, Additive manufacturing, Computer aided design, Optics manufacturing, Metals, Telescopes, Spatial light modulators, Space telescopes, Silicon, Diamond turning, Lightweight mirrors

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Showing 5 of 9 publications

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