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Measurement of longwave sky radiance distribution

Messung der Verteilung der langwelligen Himmels-Strahlung

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Summary

To study the applicability of IR-sensors in an outdoor environment detailed knowledge in needed about the atmospheric longwave radiance. For this purpose an IR-scanning radiometer has been developed, able to measure the IR-radiance of the sky-hemisphere. The sensor measures the radiance of 59 sample elements in four wavelength bands in 3 minutes. Due to inside calibration no external reference sources are needed. Illustrative examples of the angular radiance distribution are given for two wavelengths bands, i.e. λ > 3 μm and 8 < λ < 14 μm.

Zusammenfassung

Um die Anwendungsmöglichkeiten von IR-Sensoren im Außenklima beurteilen zu können, ist eine detaillierte Kenntnis der langwelligen atmosphärischen Strahlung not-wendig. Zu diesem Zweck ist ein Radiometer entwickelt worden, das den Himmel abtastet. Das Radiometer mißt die Strahldichte von 59 Elementen in 4 Wellenbereichen in 3 Minuten. Weil eine interne Kalibration stattfindet, sind keine weiteren Referenzkörper notwendig. Einige illustrative Beispiele der richtungsabhängigen Strahldichte werden in zwei Wellenbereichen, d.h. λ > 3 μm und 8 < λ < 14 μm gezeigt.

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References

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Authors and Affiliations

  1. Physics Laboratory TNO, P.O. Box 96864, 2509 JG, The Hague, The Netherlands

    P. A. M. Jacobs

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  1. P. A. M. Jacobs
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Jacobs, P.A.M. Measurement of longwave sky radiance distribution. Arch. Met. Geoph. Biocl., Ser. B 34, 257–265 (1984). https://doi.org/10.1007/BF02265491

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  • DOI: https://doi.org/10.1007/BF02265491

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