Design and testing of cryogenic infrared relay optics

Christofer Siemens; Torsten Gross; Martin Hinz; Manfred Uebele; Lukas Kress; Denis Lober; Nicolas Ummen; Dirk Jahn; Hans Becker

doi:10.1117/12.2558819

18 May 2020 Design and testing of cryogenic infrared relay optics

Christofer Siemens, Torsten Gross, Martin Hinz, Manfred Uebele, Lukas Kress, Denis Lober, Nicolas Ummen, Dirk Jahn, Hans Becker

Author Affiliations +

Proceedings Volume 11388, Image Sensing Technologies: Materials, Devices, Systems, and Applications VII; 113880N (2020) https://doi.org/10.1117/12.2558819
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

METimage will be the Visible/Infrared Imaging mission (VII) of the METOP-SG series. It is going to provide moderate ground resolution optical imaging of clouds, aerosols and surface variables in 20 spectral channels ranging from 443 to 13 345 nm with a spatial sampling of 500 m. The METimage instrument is in development by an industrial team led by Airbus Defence and Space GmbH on behalf of the German space administration DLR with funding from the German Federal Ministry of Transport and Digital Infrastructure (BMVI) and co funding by EUMETSAT under DLR Contract No. 50EW1521. In the context of this program Hensoldt Optronics GmbH designs, integrates and tests novel multispectral filter assemblies and refractive relay infrared optics for the METimage instrument. Both assemblies have to deliver optical performance in cryogenic-vacuum conditions post launch and deployment loads, which is a challenging demand. The development led to intricate glue-free mounting designs for filters and lenses. To establish the system’s optical performance a combination of prototyping, optical simulation, ambient adjustment and cryogenic-vacuum verification is necessary. For the latter a hexapod-carried OGSE was developed, capable to illuminate and sensing wavefront errors at multiple MWIR and LWIR wavelengths. This paper provides insights into the opto-mechanical designs of the relay optics and the hyperspectral filters. Furthermore the setups for adjustment and qualification tests will be described. The current project progress is reflected here within.

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Christofer Siemens, Torsten Gross, Martin Hinz, Manfred Uebele, Lukas Kress, Denis Lober, Nicolas Ummen, Dirk Jahn, and Hans Becker "Design and testing of cryogenic infrared relay optics", Proc. SPIE 11388, Image Sensing Technologies: Materials, Devices, Systems, and Applications VII, 113880N (18 May 2020); https://doi.org/10.1117/12.2558819

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