Evaluation of straylight characteristics of the Sentinel-5 NIR spectrometer optics

M. Merschdorf; L. Platos; P. Petruck; B. Michel; B. Harand

doi:10.1117/12.2536018

12 July 2019 Evaluation of straylight characteristics of the Sentinel-5 NIR spectrometer optics

M. Merschdorf, L. Platos, P. Petruck, B. Michel, B. Harand

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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111802R (2019) https://doi.org/10.1117/12.2536018
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece

Abstract

Jena-Optronik GmbH is developing the Sentinel-5 NIR spectrometer optics operating in the spectral range from 685 nm to 773 nm. It is purely based on refractive optics and makes use of a grating as dispersive element and a prism for aberration correction. One of the design drivers for the optics design is straylight as small absorption effects in the atmosphere need to be detected. To minimize false light on the detector the straylight characteristics have been analyzed and optimized together with Hembach Photonik GmbH. Special attention needs to be paid to the dispersive nature of the optics as compared to a pure imaging system. Sources of ghosts and scattered light such as surface roughness, particle contamination and scattering at mechanical surfaces are quantified. Main contributors to straylight are identified and strategies for straylight reduction are discussed. Among others this comprises effective means to suppress out-of-band light.

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M. Merschdorf, L. Platos, P. Petruck, B. Michel, and B. Harand "Evaluation of straylight characteristics of the Sentinel-5 NIR spectrometer optics", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111802R (12 July 2019); https://doi.org/10.1117/12.2536018

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KEYWORDS

Sensors

Scattering

Light scattering

Reflection

Diffraction gratings

Beam splitters

Mirrors

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