NIS Temperature dependance of wavelength zeropoint
An early demonstration of the effect of CDS optical bench temperature
on the NIS wavelength zeropoint. The temperature varies as a result
of different illumination conditions caused by changing the CDS
pointing. These results are taken from analysis of the OV 630A line
in the daily synoptic scans. The dots show the recorded optical bench
temperature and the open circles the pixel centroid of the OV line.
Prior to 12-Jun-96 a reasonable correlation can be seen. On that
date the stabilisation temperature was raised to 23 Deg. C ie it was
held above the peak of its natural level. Since then the
temperature and the wavelength zeropoint have been very stable,
although some analysis hints that a small temperature dependence
still remains.
See SYNOP_STAB_DEMO.
The sharp drop in temperature around 28-Jun was caused by closure of
the CDS doors for station keeping manouvers.
From the CDS Mission Operations Management Team
at the Rutherford Appleton Laboratory.
to CDS Science Engineering page