Anamorphotic telescope for earth observation in the mid-infrared range

Peschel, Thomas; Damm, Christoph; Scheiding, Sebastian; Beier, Matthias; Risse, Stefan; Nikolov, Susanne; Holota, Wolfgang; Weiss, S.; Bartsch, P.

doi:10.1117/12.2304168

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…The concept of the optical system bases completely on metal mirrors, which were manufactured by single-point diamond turning [4] . Where possible, two mirrors were grouped into a module and fabricated in a single manufacturing run together with the respective mounting and alignment features [5]- [7] .…”

Section: Icso 2018 International Conference On Space Opticsmentioning

confidence: 99%

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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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Section: Icso 2018 International Conference On Space Opticsmentioning

confidence: 99%

“…Due to the high precision of the SPDT process, this strategy allows for a significantly simplified adjustment of the optical system [6]- [7] . An interferometric image could be acquired immediately after mechanical assembly and few iterations were necessary to find the optimum position for the mirror modules.…”

Section: Integration and Alignment Conceptmentioning

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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“…Metal optics for space and ground-based applications have been state of the art for several years [1][2][3][4][5][6][7][8][9][10]. Polishable coatings like X-ray amorphous electroless nickel-phosphorus (NiP) [3,4,[11][12][13][14][15][16][17][18][19][20][21] extend the range of applicable surface finishing methods to include chemical mechanical or computer controlled polishing (CMP, CCP) or Magnetorheological finishing (MRF) [3,4,10,[18][19][20][21][22] and improve the achievable optical surface accuracy.…”

Section: Introductionmentioning

confidence: 99%

Theoretical compensation of static deformations of freeform multi mirror substrates

Hartung,

von Lukowicz,

Kinast

2018

Preprint

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Varying temperatures influence the figure errors of freeform metal mirrors by thermal expansion. Furthermore, different materials lead to thermo-elastic bending effects. The article presents a derivation of a compensation approach for general static loads. Utilizing perturbation theory this approach works for shape compensation of substrates which operate in various temperature environments. Verification is made using a finite element analysis which is further used to produce manufacturable CAD models. The remaining low spatial frequency errors are deterministically correctable using diamond turning or polishing techniques. (120.4880) Optomechanics, (120.6810) Thermal effects, (260.3910) Metal optics, (120.4610) Optical fabrication, (220.1920) Diamond machining

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“…Furthermore, optical and mechanical reference structures on the mirrors may be manufactured in the same SPDT run. This strategy allows for a significantly simplified adjustment of the optical system [11,12]. The respective duolith mirrors of the DESIS instrument are depicted in Fig.…”

Section: A Mirror Designmentioning

confidence: 99%

“…These elements will be finished by single-point diamond fly-cutting [11,12] in a single machining run. They will be used to define a high precision starting point for the adjustment of the mirrors.…”

Section: B Instrument Housingmentioning

confidence: 99%