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Next: 13.15 Point spread function
Up: 13 Calibration G Products
Previous: 13.13 Inhomogeneous FCS illumination
Description Parameter: section 4.2.6
Processing Level: SPD
Usage in processing: section 7.4.3
File Type: FITS Image
Units: Dimensionless
File Names: PC1FLAT, PC2FLAT
The responsivity of the individual detector pixels in the C100 and the C200
arrays vary from one filter to the other. These variations are different
for different pixels in the array. Consequently, the flatfield of the
array differs from one filter to the other. The flatfield is in principle
calibrated out by the FCS measurement, but for multi-filter measurements
where only 1 FCS measurement is taken, the flatfield correction must be
applied when determining the fluxes in the filters in which the FCS was not
taken.
For both detector flat field calibration files the following FITS keywords
are common:
NAXIS = 3
TYPE = REAL*4
AXIS Length Description 1 9 C100 pixels, in same order as SPD. 2 7 filters:(see section A.1) 3 2 Correction and uncertainty
AXIS Length Description 1 4 C200 pixels in the same order as in SPD 2 5 Filters:(see section A.1) 3 2 Correction and uncertainty
ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc