PDS_VERSION_ID        = PDS3

^PDF_DOCUMENT         = "PFS_SWC_CALIB.PDF"
PRODUCT_ID            = PFS_SWC_CALIB
RELEASE_ID            = 0001
REVISION_ID           = 0000
RECORD_TYPE           = FIXED_LENGTH
DATA_SET_ID           = "MEX-M-PFS-2-EDR-EXT3-V1.0"
PRODUCT_CREATION_TIME = 2010-12-07T12:01:24.717


OBJECT                = PDF_DOCUMENT
DOCUMENT_NAME         = "CALIBRATION OF THE PLANETARY FOURIER SPECTROMETER
                      SHORT WAVELENGTH CHANNEL"
PUBLICATION_DATE      = 2010-12-07
DOCUMENT_TOPIC_TYPE   = "CALIBRATION REPORT"
INTERCHANGE_FORMAT    = BINARY
DOCUMENT_FORMAT       = "ADOBE PDF"
DESCRIPTION           = "The Planetary Fourier Spectrometer (PFS) experiment
on board the Mars Express mission has two channels covering the 1.2 5.5 m 
(SWC) and the 5.5 45 m (LWC). The Short Wavelength Channel (SWC) measures 
part of the thermal emission spectrum and the solar reflected spectrum of 
Mars between 1700 cm-1 and 8200 cm-1 with a spectral resolution of 1.3 cm-1, 
in absence of apodization. We present here the calibration of this channel 
and its performance. The instrument calibration has been performed on 
ground, before launch, in space during Near Earth Verification (NEV) 
measurements, and at Mars. Special attention has been given to the problem 
of micro-vibrations on board the spacecraft.  In order to obtain correct 
results, the source - instrument - detector interaction for the thermal part 
is studied very accurately. The instrument shows a non linear behaviour with 
source intensity. The SNR increases with amplification, so high gain factors 
are usually used. The detector is, in space, cooled by a passive radiator, 
and works around 210 215 K. The calibration source (an internal lamp) shows 
variations during a pericentre pass and therefore impose a complex procedure 
for the SW channel calibration. Mechanical micro vibrations strongly affect 
part of the spectrum. We discuss the validity of the present calibration, 
and indicate possible future developments. Samples of the calibrated data 
are given to show the performance of the experiment and its scientific 
potentialities."

END_OBJECT            = PDF_DOCUMENT
END