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13.13 Inhomogeneous FCS illumination of PHT-P


Description Parameter:	 section 4.5.4
Processing Level:	 SPD
Usage in processing:	 section 7.4.2
File Type:		 FITS Image
Units:			 dimensionless
File Names:		 PP1FCSAP, PP2FCSAP, PP3FCSAP,

As already implemented in the case of PHT-C (FCS illumination matrixes ``PC1ILLUM'' in section 13.12.1 and ``PC2ILLUM'' in section 13.12.2), also the inhomogenous FCS illumination for PHT-P must be corrected for in PHT OLP. This implies that the power on the detector from the FCS does not scale directly with the aperture area (which whould be the case for a perfectly homogeneous illumination) but that an additional correction factor is necessary.

For all aperture correction Cal G files the following FITS keywords are common:
NAXIS = 4
TYPE = REAL*4

13.13.1 Product PP1FCSAP: FCS aperture correction tables for P1


AXIS		Length		Description
1		14		apertures: CHWII position (see section A.1)
2		10		filters: CHWIII position (see section A.1)
3		2		Each FCS
4		2		Correction and uncertainty

13.13.2 Product PP2FCSAP: FCS aperture correction tables for P2


AXIS		Length		Description
1		14		apertures: CHWII position (see section A.1)
2		2		filters: 20, 25 m
3		2		Each FCS
4		2		Correction and uncertainty

13.13.3 Product PP3FCSAP: FCS aperture correction tables for P3


AXIS		Length		Description
1		14		Apertures: CHWII position (see section A.1)
2		2		Filters: 60, 100 m
3		2		Each FCS
4		2		Correction and uncertainty

Next: 13.14 Wavelength dependent detector Up: 13 Calibration G Products Previous: 13.12 Array Illumination by

ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc