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Proceedings Paper

Stray light analysis of SALEX instrument
Author(s): Sun Jeong Ham; Hanshin Lee; Jae-Min Lee; Sug-Whan Kim; Tony Richards; Mike Lockwood
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Paper Abstract

Discrepancies between recent global earth albedo anomaly data obtained from the climate models, space and ground observations call for a new and better earth reflectance measurement technique. The SALEX (Space Ashen Light Explorer) instrument is a space-based visible and IR instrument for precise estimation of the global earth albedo by measuring the ashen light reflected off the shadowy side of the Moon from the low earth orbit. The instrument consists of a conventional 2-mirror telescope, a pair of a 3-mirror visible imager and an IR bolometer. The performance of this unique multi-channel optical system is sensitive to the stray light contamination due to the complex optical train incorporating several reflecting and refracting elements, associated mounts and the payload mechanical enclosure. This could be further aggravated by the very bright and extended observation target (i.e. the Moon). In this paper, we report the details of extensive stray light analysis including ghosts and cross-talks, leading to the optimum set of stray light precautions for the highest signal-to-noise ratio attainable.

Paper Details

Date Published: 2 September 2008
PDF: 14 pages
Proc. SPIE 7069, Optical System Contamination: Effects, Measurements, and Control 2008, 70690L (2 September 2008); doi: 10.1117/12.794505
Show Author Affiliations
Sun Jeong Ham, Yonsei Univ. (South Korea)
Rutherford Appleton Lab. (United Kingdom)
Hanshin Lee, Rutherford Appleton Lab. (United Kingdom)
Univ. of Oxford (United Kingdom)
Jae-Min Lee, Yonsei Univ. (South Korea)
Sug-Whan Kim, Yonsei Univ. (South Korea)
Tony Richards, Rutherford Appleton Lab. (United Kingdom)
Mike Lockwood, Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 7069:
Optical System Contamination: Effects, Measurements, and Control 2008
Sharon A. Straka, Editor(s)

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