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Recent development in the 3-12 µm radiometric calibration of the DAIS 7915

Strobl, Peter and Zhukov, Boris (1998) Recent development in the 3-12 µm radiometric calibration of the DAIS 7915. In: 1st EARSel Workshop on Imaging Spectroscopy Remote Sensing Laboratories, University of Zurich, Switzerland 6-8 October 1998, pp. 69-79. 1st EARSel Workshop on Imaging Spectroscopy, Remote Sensing Laboratories, University of Zurich, Switzerland, 6-8 October 1998. ISBN 2-90 885-22-0.

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Abstract

Radiometric calibration of sensors in the thermal infrared region is a critical issue especially for the DAIS 7915. As the scan mechanism of the DAIS is of the Kennedy type, there is a considerable fraction of intrinsic background radiation in the overall signal presented to the detector. The contribution of the background to the total signal increases towards larger scan angles. Until 1998 the 6 Bands in the 8-12 µm region were calibrated using the two external blackbodies of the DAIS operated at different temperatures during airborne data takes. This method did not account for scan angle dependencies other than the theoretical Kennedy intrinsic vignetting. Evaluation of in-flight data made evident that this is method is not satisfactory. The mid infrared band was not calibrated at all due to uncertainties in the estimation of emitted and reflected radiation components of the blackbody and housing. A new approach was therefore developed using a simplified sensor model. This paper presents the calibration strategy, which is based on laboratory measurements. The thermal data are processed and calibrated using laboratory coefficients, blackbody readings and scanner housing temperature measurements. This paper introduces the technique, the algorithm and its implementation. Examples of laboratory and in-flight data are shown together with results of a preliminary in-flight validation.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Recent development in the 3-12 µm radiometric calibration of the DAIS 7915
Authors:
AuthorsInstitution or Email of Authors
Strobl, PeterUNSPECIFIED
Zhukov, BorisUNSPECIFIED
Date:1998
Journal or Publication Title:1st EARSel Workshop on Imaging Spectroscopy Remote Sensing Laboratories, University of Zurich, Switzerland 6-8 October 1998
Page Range:pp. 69-79
ISBN:2-90 885-22-0
Status:Published
Event Title:1st EARSel Workshop on Imaging Spectroscopy, Remote Sensing Laboratories, University of Zurich, Switzerland, 6-8 October 1998
Organizer:EARSel, Paris, 2, avenue Rapp, 75340 PARIS CEDEX 07 - France
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institut für Optoelektronik
Deposited By: elib DLR-Beauftragter
Deposited On:10 May 2006
Last Modified:06 Jan 2010 23:16

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