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

Schwarzmaier, Thomas and Baumgartner, Andreas and Gege, Peter and Köhler, Claas and 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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Abstract

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

Document Type:Conference or Workshop Item (Poster)
Title:The Radiance Standard RASTA of DLR's calibration facility for airborne imaging spectrometers
Authors:
AuthorsInstitution or Email of Authors
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
Date:September 2012
Page Range:pp. 1-6
Status:Published
Keywords:Radiance Standard
Event Title:SPIE Remote Sensing 2012
Event Location:Edinburgh, United Kingdom
Event Type:international Conference
Event Dates:24.-27.Sept. 2012
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Thomas Schwarzmaier
Deposited On:31 Oct 2012 12:23
Last Modified:18 Mar 2013 12:10

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