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Proceedings Paper

Spaceborne spectrometer calibration with LEDs
Author(s): Jens Nieke; M. Solbrig; Karl-Heinz Suemnich; Gerhard Zimmermann; Hans-Peter Roeser
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Paper Abstract

Until now incandescent lamp, sun and moon calibrations have been successfully applied for in-flight calibration of spaceborne Earth observation imaging sensors. The performance development of LEDs in the past decade guided to higher luminous efficiencies, broader spectral coverage, lower degradation of light output over time and lower power consumption. These advantages make LEDs to a candidate for radiometric and spectral calibration of spaceborne spectrometers. For analysing LEDs for space in-flight calibration a set of LEDs has been characterised and a simulation of space radiation quantities (i.e. proton and electron radiation for a polar low-Earth orbit) has been carried out. Additional vacuum tests (outgassing behaviour) demonstrated a possible application of LEDs with epoxy housing for the future space environment. Further on, a concept for long-term temperature stabilisation has been developed for solving the main problem of LED in-flight calibration, i.e. the temperature dependency of the irradiance. Consequently, this study demonstrates that (1) a degradation of LEDs due to space environment is not expected, that (2) long-term temperature stability of LEDs can be ensured, and that (3) the higher blue part of ‘white’ LEDs would best suit ocean-colour scientists needs.

Paper Details

Date Published: 15 November 2000
PDF: 11 pages
Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000); doi: 10.1117/12.494228
Show Author Affiliations
Jens Nieke, DLR (Germany)
M. Solbrig, DLR (Germany)
Karl-Heinz Suemnich, DLR (Germany)
Gerhard Zimmermann, DLR (Germany)
Hans-Peter Roeser, DLR (Germany)

Published in SPIE Proceedings Vol. 4135:
Earth Observing Systems V
William L. Barnes, Editor(s)

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