The TROPOMI Telescope

Nijkerk, David; Venrooy, B. van; Doorn, Peter Van; Henselmans, R.; Draaisma, F.; Hoogstrate, A.M.

doi:10.1117/12.2309035

International Conference on Space Optics — ICSO 2012 2017

DOI: 10.1117/12.2309035

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The TROPOMI Telescope

David Nijkerk

B. van Venrooy

Peter Van Doorn

et al.

Abstract: Abstract-In this paper, we discuss the two-mirror pushbroom telescope for TROPOMI. Using freeform optics, it has unprecedented resolution. The complete cycle of freeform optical design, analysis, manufacturing, metrology and functional test on a breadboard setup is described, focusing on the specific complexities concerning freeforms. The TROPOMI flight telescope will be manufactured in summer 2012. freeform optics; asphere; metrology; TROPOMI; NANOMEFOS

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Cited by 4 publications

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Analysis method of the Offner hyperspectral imaging spectrometer based on vector aberration theory

et al. 2021

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Compact hyperspectral imaging spectrometers with a wide field of view (FoV) have significant application value. However, the aberration field of such imaging spectrometers is sensitive, and varies for different wavelengths when reducing the spectrometer volume. It is difficult to explain the variation in the aberration field using traditional aberration theory. In this study, we extend the vector aberration theory (VAT) to the Offner imaging spectrometer. We deduce the expression of the aberration field decenter vector of the Offner spectrometer based on the real ray-trace method. Furthermore, we derive the expression of the third-order vector aberration of the system. Subsequently, we explain some common phenomena in the Offner imaging spectrometer. This new analysis method can provide useful guidance for designing a compact wide FoV Offner imaging spectrometer. With this new insight, we designed a compact wide FoV Offner imaging spectrometer with a freeform tertiary mirror. Compared to conventional spectrometers with the same specifications, the total length of the spectrometer decreased by 37%, and the volume by 75%. After the tolerance analysis, the freeform optics satisfied the existing machining technology. The analysis method presented in this paper furthers the designer’s understanding of the aberration field of the Offner imaging spectrometer. The method is significant in the design of a compact wide FoV Offner imaging spectrometer with freeform optics.

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Analysis method of the Offner hyperspectral imaging spectrometer based on vector aberration theory

et al. 2021

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Design method of wide field-of-view imaging systems using Gaussian radial basis functions freeform surfaces

Yang

Cheng

et al. 2021

Appl. Opt.

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High optical performance systems with wide field-of-view (FOV) have important applications in remote sensing. The radial basis functions, which have a prominent local characteristic in surface description, have attracted much attention in recent years. In this paper, an effective design method for the wide FOV imaging system using Gaussian radial basis function freeform surfaces is proposed. The FOV of the optical system is extended from a relatively small value to a larger one, and the Gaussian radial basis function surfaces are extended stepwise based on certain criteria. A high image quality and small distortion off-axis freeform three-mirror system with a wide FOV ( 60 ∘ × 0.6 ∘ ) is designed as an example. Tolerance analysis considering both surface figure error and assembly error is performed. The design results demonstrate the effectiveness of the proposed method.

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Design of a linear field-of-view oblique imaging system with a low distortion

Xu¹,

Chen²,

Wang³

et al. 2022

Appl. Opt.

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For conventional ultra-wide-angle or oblique cameras, it is difficult to fully correct the f − tan θ distortion without the scarification of the edge image performance. In this paper, we propose a linear field-of-view (FOV) oblique imaging system by varying the entrance pupil size over the FOV with freeform mirrors, and thus the diffraction limit around the edge field can be improved. An off-axis reflective system with conic surfaces has been selected as the initial system, and a point-by-point surface design method is then applied on the primary mirror to increase the entrance pupil size for edge fields in the FOV direction. All surfaces for the system converted to freeform during the optimization process, and the FOV of the final design can achieve + 35 ∘ to + 65 ∘ , with a distortion less than 1.1%. It is possible to achieve a wide-linear FOV over 130° with a low distortion by the integration of two oblique systems and a central imaging channel.

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The TROPOMI Telescope

Cited by 4 publications

References 2 publications

Analysis method of the Offner hyperspectral imaging spectrometer based on vector aberration theory

Analysis method of the Offner hyperspectral imaging spectrometer based on vector aberration theory

Design method of wide field-of-view imaging systems using Gaussian radial basis functions freeform surfaces

Design of a linear field-of-view oblique imaging system with a low distortion

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