Spaceborne spectrometer calibration with LEDs

Jens Nieke; M. Solbrig; Karl-Heinz Suemnich; Gerhard Zimmermann; Hans-Peter Roeser

doi:10.1117/12.494228

15 November 2000 Spaceborne spectrometer calibration with LEDs

Jens Nieke, M. Solbrig, Karl-Heinz Suemnich, Gerhard Zimmermann, Hans-Peter Roeser

Proceedings Volume 4135, Earth Observing Systems V; (2000) https://doi.org/10.1117/12.494228
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download Citation

Jens Nieke, M. Solbrig, Karl-Heinz Suemnich, Gerhard Zimmermann, and Hans-Peter Roeser "Spaceborne spectrometer calibration with LEDs", Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000); https://doi.org/10.1117/12.494228

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