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4 Wavelength Calibration Accuracies of ISOPHOT-S

As ISOPHOT-S has fixed gratings, no uncertainties because of mechanical jitter are involved. The wavelength scale has been best described by second order polynomials fitted to the measured central positions of 7 to 9 unresolved lines per detector array. The wavelength calibration is more accurate for the centre of the array than for the edge; both accuracy values are listed in Table 4.1.

 

Table 4.1:   Wavelength Calibration Accuracy for ISOPHOT-S

	array	range	accuracy array centre	accuracy array edge
		[m]	[m]	[m]
	SS	2.5 - 4.9	0.0020	0.0044
	SL	5.9 - 11.7	0.0035	0.0078