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The Radiance Standard RASTA of DLR's calibration facility for airborne imaging spectrometers

Schwarzmaier, Thomas und Baumgartner, Andreas und Gege, Peter und Köhler, Claas und Lenhard, Karim (2012) The Radiance Standard RASTA of DLR's calibration facility for airborne imaging spectrometers. SPIE Remote Sensing 2012, 24.-27.Sept. 2012, Edinburgh, United Kingdom.

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Kurzfassung

The German Aerospace Center (DLR) operates the Calibation Home Base (CHB) as a facility for the calibration of airborne imaging spectrometers and for field spectrometers. Until recently, absolute radiometric calibration was based on an integrating sphere that is traceable to SI units through calibration at the German Metrology Institute PTB. However, the stability of the radiance output was not monitored regularly and reliably. This was the motivation to develop a new radiance standard (RASTA) which allows monitoring in the wavelength range from 380 to 2500 nm. Radiance source is a diffuse reflector illuminated by a tungsten halogen lamp. Five radiometers mounted in a special geometry are used for monitoring. This setup improves twofold the uncertainty assessment compared to the previously used integrating sphere. Firstly, lamp irradiance and panel reflectance have been calibrated at PTB additionally to the radiance of the complete system. This calibration redundancy allows to detect systematic errors and to reduce calibration uncertainty. Secondly, the five radiometers form a redundant control system to measure changes of the spectral radiance. This enables long-time monitoring of the radiance source including assessment of the uncertainty caused by aging processes. Further advantages concern the reduction of periods of non-availability, applicability to sensors with larger field of view, and the possibility to alter intensity and spectral shape in a well-known way by exchanging the reflector. RASTA has been calibrated at PTB in November 2011 in the wavelength range from 350 to 2500 nm

Dokumentart:Konferenzbeitrag (Poster)
Titel:The Radiance Standard RASTA of DLR's calibration facility for airborne imaging spectrometers
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schwarzmaier, Thomasthomas.schwarzmaier@dlr.de
Baumgartner, Andreasandreas.baumgartner@dlr.de
Gege, Peterpeter.gege@dlr.de
Köhler, Claasclaas.koehler@dlr.de
Lenhard, Karimkarim.lenhard@dlr.de
Datum:September 2012
Seitenbereich:Seiten 1-6
Status:veröffentlicht
Stichwörter:Radiance Standard
Veranstaltungstitel:SPIE Remote Sensing 2012
Veranstaltungsort:Edinburgh, United Kingdom
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:24.-27.Sept. 2012
Veranstalter :SPIE
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung
Hinterlegt von: Thomas Schwarzmaier
Hinterlegt am:31 Okt 2012 12:23
Letzte Änderung:18 Mär 2013 12:10

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