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Proceedings Paper

APEX calibration facility: status and first commissioning results
Author(s): Birgit Suhr D.D.S.; Jochen Fries; Peter Gege; Horst Schwarzer
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Paper Abstract

The paper presents the current status of the operational calibration facility that can be used for radiometric, spectral and geometric on-ground characterisation and calibration of imaging spectrometers. The European Space Agency (ESA) co-funded this establishment at DLR Oberpfaffenhofen within the framework of the hyper-spectral imaging spectrometer Airborne Prism Experiment (APEX). It was designed to fulfil the requirements for calibration of APEX, but can also be used for other imaging spectrometers. A description of the hardware set-up of the optical bench will be given. Signals from two sides can alternatively be sent to the hyper-spectral sensor under investigation. Frome one side the spatial calibration will be done by using an off-axis collimator and six slits of different width and orientation to measure the line spread function (LSF) in flight direction as well as across flight direction. From the other side the spectral calibration will be performed. A monochromator provides radiation in a range from 380 nm to 13 μm with a bandwidth between 0.1 nm in the visible and 5 nm in the thermal infrared. For the relative radiometric calibration a large integrating sphere of 1.65 m diameter and exit port size of 55 cm × 40 cm is used. The absolute radiometric calibration will be done using a small integrating sphere with 50 cm diameter that is regularly calibrated according to national standards. This paper describes the hardware components and their accuracy, and it presents the software interface for automation of the measurements.

Paper Details

Date Published: 3 October 2006
PDF: 9 pages
Proc. SPIE 6361, Sensors, Systems, and Next-Generation Satellites X, 636110 (3 October 2006); doi: 10.1117/12.689924
Show Author Affiliations
Birgit Suhr D.D.S., DLR (Germany)
Jochen Fries, DLR (Germany)
Peter Gege, DLR (Germany)
Horst Schwarzer, DLR (Germany)

Published in SPIE Proceedings Vol. 6361:
Sensors, Systems, and Next-Generation Satellites X
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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