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Proceedings Paper

Stray-light analysis of Amon-Ra instrument
Author(s): Hanshin Lee; Sug-Whan Kim; Tony Richards; Ian Tosh; Nigel Morris; Mike Lockwood
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Paper 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.

Paper Details

Date Published: 24 August 2005
PDF: 12 pages
Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 586706 (24 August 2005); doi: 10.1117/12.639585
Show Author Affiliations
Hanshin Lee, Yonsei Univ. (South Korea)
Rutherford Appleton Lab. (United Kingdom)
Sug-Whan Kim, Yonsei Univ. (South Korea)
Tony Richards, Rutherford Appleton Lab. (United Kingdom)
Ian Tosh, Rutherford Appleton Lab. (United Kingdom)
Nigel Morris, Rutherford Appleton Lab. (United Kingdom)
Mike Lockwood, Rutherford Appleton Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 5867:
Optical Modeling and Performance Predictions II
Mark A. Kahan, Editor(s)

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