Stray-light analysis of Amon-Ra instrument

Hanshin Lee; Sug-Whan Kim; Tony Richards; Ian Tosh; Nigel Morris; Mike Lockwood

doi:10.1117/12.639585

24 August 2005 Stray-light analysis of Amon-Ra instrument

Hanshin Lee, Sug-Whan Kim, Tony Richards, Ian Tosh, Nigel Morris, Mike Lockwood

Proceedings Volume 5867, Optical Modeling and Performance Predictions II; 586706 (2005) https://doi.org/10.1117/12.639585
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The Amon-Ra instrument is the main optical payload of the EARTHSHINE satellite and a unique Earth reflectance monitor. It consists of two separate optical systems, one imaging photon fluxes over the visible waveband and the other bolometrically measuring global emissions while the satellite orbits about the L1-Lagrange point. Two optical systems were designed to share the same apertures to the Sun and Earth and view the same target along the same direction as the spacecraft rotates. This design approach is advantageous in minimising the optics alignment problem as well as the differential degradation of front-end optics and detectors between the two systems. Nevertheless, such an approach makes it diffcult to control stray-light separately in each system and the signal of one source may be corrupted due to the other. In this paper, we discuss the stray-light performance of the Amon-Ra instrument and report the analysis results.

Citation Download Citation

Hanshin Lee, Sug-Whan Kim, Tony Richards, Ian Tosh, Nigel Morris, and Mike Lockwood "Stray-light analysis of Amon-Ra instrument", Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 586706 (24 August 2005); https://doi.org/10.1117/12.639585

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