Black coatings for combined stray light and thermal passive management for the challenging environmental conditions of Solar Orbiter

Montemurro, Luca; Zanetti, Francesco; Simone, Antonia; Schillaci, Tiziano; Castronuovo, Marco; Katsir, Dina; Shabtai, K.

doi:10.1117/12.2536097

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14 Although, baffles with co-axial vanes or light traps can be used for some critical components, or those, which cannot be approached closely (Figure 11,B). All of these elements should be coated by a specific black coating as Acktar Fractal 15 or similar.…”

Section: Straylight Mitigationmentioning

confidence: 99%

Straylight analyses and mitigation strategies for the ELT METIS instrument

Muslimov

Agócs

Lloro

et al. 2021

Optical Design and Engineering VIII

View full text Add to dashboard Cite

The Mid-infrared ELT Imager and Spectrograph (METIS) is one of the three first-generation instruments on the Extremely Large Telescope (ELT). It will provide 20 instrument configurations for direct and high-contrast imaging, medium and high resolution spectroscopy in the wavelength range of 3 − 13 . The straylight will affect the image contrast and objects recognition thus influencing the final instrument performance. For this reason it should be taken into account and accurately modeled at the design stage. In the present study we consider straylight from the following sources: surface roughness and defects of the optical surfaces, multiple reflections and diffraction, which will all influence the instrument performance. We estimate their influence using a bottom-up modelling approach at the system level and derive the requirements for some critical parameters. Using empirical and analytical models and performing non-sequential raytracing we demonstrate that the target straylight level can be reached in the current design with reasonable specifications on the optical components.

show abstract

Section: Straylight Mitigationmentioning

confidence: 99%

Straylight analyses and mitigation strategies for the ELT METIS instrument

Muslimov

Agócs

Lloro

et al. 2021

Optical Design and Engineering VIII

View full text Add to dashboard Cite

show abstract

Design of a hyperspectral imager using COTS optics for small satellite applications

Prentice

Grøtte

Sigernes

et al. 2021

International Conference on Space Optics — ICSO 2020

View full text Add to dashboard Cite

This paper describes the design of a pushbroom hyperspectral imager built for small satellite applications. Its design allows for low weight, low cost, and flexible configuration making it accessible to both smaller projects and supplemental to larger ones. The imager is constructed from commercial off-the-shelf (COTS) optical and sensor components, along with a machined mechanical structure to enable rapid development times. The presented configuration was selected based on a 6U CubeSat ocean color mission developed at the Norwegian University of Science and Technology.The optical design includes three 50 mm lens objectives, a precision-cut 50 μm slit, a blazed transmission grating, and a detecting CMOS sensor. It has the ability to record wavelengths in the spectral range of 300−1000 nm, e.g. in the visible and near infrared spectrum. The calculated bandpass of typically about 5 nm can be configured or binned for the specific application needs. Since targets, such as the ocean surface, are dark and non-Lambertian, it is challenging to reach the necessary sensitivity that ensures a high signal-to-noise ratio (SNR) in the image. The imaging system presented in this paper is built for obtaining that sufficient SNR for a given resolution, both in the spatial and spectral domains. The satellite will be launched into a 500 km altitude sun-synchronous orbit. While in orbit, the imager utilizes the pushbroom concept of sequentially gathering lines of pixels, of all wavelengths in range, as it passes over its target. The pushbroom concept, combined with the optical design, yields a swath width of up to 70 km per scan line with a sampling distance of 49 × 60 m on ground. A final consideration must be made due to the large size of raw hyperspectral data cubes and the constraints this sets on satellite power consumption for downlink. This can be significantly improved through onboard image processing (e.g. correction, classification, anomaly detection, feature extraction, and dimensionality reduction) rather than in the physical design itself. Performance characteristics of this specific imager are presented along with a trade-off analysis of configuration possibilities in the optical design.

show abstract

Black coatings for combined stray light and thermal passive management for the challenging environmental conditions of Solar Orbiter

Cited by 2 publications

References 0 publications

Straylight analyses and mitigation strategies for the ELT METIS instrument

Straylight analyses and mitigation strategies for the ELT METIS instrument

Design of a hyperspectral imager using COTS optics for small satellite applications

Contact Info

Product

Resources

About