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Ultraprecise flat mirrors for the pointing unit of the DESIS instrument on board of the ISS

Risse, Stefan and Kinast, Jan and Gebhardt, Andreas and Jende, Robert and Kleinbauer, Knut and Müller, Sandra and Peschel, Thomas and Damm, Christoph and Schwarzenberg, Matthias and Kroedel, Matthias and Walter, Ingo and Krutz, David (2019) Ultraprecise flat mirrors for the pointing unit of the DESIS instrument on board of the ISS. In: SPIE. SPIE.Digitial Library. SPIE 2019, 09.-12.Sep. 2019, Straßburg. DOI: 10.1117/12.2530620

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Abstract

Mirrors with excellent mechanical, thermal and optical properties are suitable for a broad spectrum of modern optical application. A growing number of multi- and hyperspectral imaging devices such as telescopes and spectrometers are based on all-reflective metal optics. Optics with higher mechanical or dynamic loads are often made of ceramics; at higher thermal loads, they are made of glass-ceramics. The DLR Earth Sensing Imaging Spectrometer (DESIS) is a space-based hyperspectral instrument developed by German Aerospace Center (DLR). The optical system of the spectrometer was designed, fabricated and pre-aligned by the Fraunhofer Institute of Applied Optics and Precision Engineering (IOF). The instrument was realized as an all-reflective system using metal-based mirrors using a modular, so-called snap-together approach. Parts of the system are flat mirrors for the pointing unit of the instrument. Two flat mirrors based on a metallic substrate material (Al 42Si) and one flat mirror based on a ceramic (HB Cesic®) were realized. The cost-efficient manufacturing technology of metal mirrors has an important advantage over glass, glass-ceramic and ceramic mirrors. For the pointing mirror, a more rigid and stiff material like HB-Cesic® was used. Different and tailored process chains were applied for both kinds of mirrors. The paper summarizes the fabrication of optical mirrors by i) grinding and polishing of ceramic matrix composite substrates; and ii) diamond machining combined with post-polishing techniques, like magnetorheological finishing (MRF) and chemical mechanical polishing (CMP) for metallic substrates. The process chains are described including testing setup and results with regard to different materials and manufacturing technologies. The mirrors show an excellent quality regarding flatness (lower 15 nm rms) and roughness (lower 1 nm rms, WLI magnification 50x).

Item URL in elib:https://elib.dlr.de/129026/
Document Type:Conference or Workshop Item (Speech)
Title:Ultraprecise flat mirrors for the pointing unit of the DESIS instrument on board of the ISS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Risse, StefanFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Kinast, JanFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Gebhardt, AndreasFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Jende, RobertFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Kleinbauer, KnutFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Müller, SandraFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Peschel, ThomasFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Damm, ChristophFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Schwarzenberg, MatthiasFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Kroedel, MatthiasFraunhofer Institut für Angewandte Optik und FeinwerktechnikUNSPECIFIED
Walter, IngoDLR, Institut für Optische SensorsystemeUNSPECIFIED
Krutz, DavidDLR, Institut für Optische SensorsystemeUNSPECIFIED
Date:August 2019
Journal or Publication Title:SPIE
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1117/12.2530620
Publisher:SPIE.Digitial Library
Status:Published
Keywords:DESIS, flat mirror, ultrapecision
Event Title:SPIE 2019
Event Location:Straßburg
Event Type:international Conference
Event Dates:09.-12.Sep. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Project DESIS auf MUSES
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Krutz, David
Deposited On:09 Sep 2019 11:59
Last Modified:09 Sep 2019 11:59

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