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Subsections



14.7 Detector Dark Signals


Description Parameter:	 Section 4.2.6
Processing Level:	 SPD 
Usage in processing:	 Section 7.3.2
File Type:		 FITS Image
Units:		 	 V/s 
File Names:		 PSDARK, PPDARK, PC1DARK, PC2DARK

To derive the absolute power falling on the detector it is necessary to remove the detector dark signal. For chopped measurements where only the signal difference matters, the dark signal correction is in principle not required. In the Cal-G file the unit for the detector dark currents is V/s.

The dark signal depends on the orbital phase of the satellite during the observation like the detector responsivity, but is not influenced by the curing in the handover window.


All products have:
NAXIS = 3
TYPE = R*4


14.7.1 Product PSDARK: PHT-S dark signals


AXIS	Length	Description
1	100	Orbital phase: each element corresponds to a phase in the
		range from 0.01 to 1.0 in steps of 0.01
2	128	Pixels - PHT-SS (1-64) and PHT-SL (65-128)
3	2	Dark signal and uncertainty


14.7.2 Product PPDARK: dark signals for detectors P1, P2, and P3


AXIS	Length	Description
1	100	Orbital phase: each element corresponds to a phase in the
		range from 0.01 to 1.0 in steps of 0.01
2	3	PHT-P detectors, P1,P2,P3
3	2	Dark signal and uncertainty


14.7.3 Product PC1DARK: dark signals for detector C100


AXIS	Length	Description
1	100	Orbital phase: each element corresponds to a phase in the
		range from 0.01 to 1.0 in steps of 0.01
2	9	C100 pixels, in same order as SPD.
3	2	Dark signal and uncertainty


14.7.4 Product PC2DARK: dark signals for detector C200


AXIS	Length	Description
1	100	Orbital phase: each element corresponds to a phase in the
		range from 0.01 to 1.0 in steps of 0.01
2	4	C200 pixels, in same order as SPD.
3	2	Dark signal and uncertainty


next up previous contents index
Next: 14.8 Correction for Signal Up: 14. Calibration-G Products Previous: 14.6 Signal Correction for
ISO Handbook Volume IV (PHT), Version 2.0.1, SAI/1999-069/Dc