Computer Science
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7453e...5s&link_type=abstract
Infrared Spaceborne Remote Sensing and Instrumentation XVII. Edited by Säuberlich, Thomas; Paproth, Carsten; Helbert, Jörn; Hie
Computer Science
Scientific paper
MERTIS (MERcury Thermal infrared Imaging Spectrometer) is an advanced infrared remote sensing instrument that is part of the ESA mission BepiColombo to planet Mercury. The enabling technology that allows sending the first spectrometer for the thermal infrared spectral range to Mercury is an uncooled microbolometer. With this detector the instrument can be operated in the hot environment of Mercury without the need of a cryogenic cooling system. The challenge is the calibration of the instrument. A radiometric and a spectroscopic breadboard model of MERTIS were used to develop proper calibration methods and to derive system parameters that support the setup of an end-to-end simulation which can process spectra of planetary analog materials from the DLR Planetary Emissivity Laboratory (PEL) as input signal in order to create a realistic representation of the MERTIS output signal. In the context of the calibration we are reporting on the ongoing efforts to remove the background signal which is contained in the raw image data sets and actually being the dominating signal portion. A background measuring method with using a shutter together with a noise reduction method based on a pixel-by-pixel correlation approach - are discussed and related to the remaining errors of the emissivity spectra which were calculated from raw images of laboratory experiments using onground calibration data sets. The results of the error evaluation and new emissivity spectra from the PEL for high temperatures of planetary analog materials are input parameters for the end-to-end simulation of MERTIS. Regarding the instrument's SNR a comparison of the simulation results and the experimental data is given and the effect of the noise reduction method.
Helbert Jörn
Hiesinger Harald
Paproth Carsten
Säuberlich Thomas
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