Computer Science
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept....2b&link_type=abstract
WFC3 Instrument Science Report 2009-02, 24 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
Orbital cycling tests were performed on WFC3 during Thermal-Vacuum test #3 in order to assess the impact of changing thermal and electrical environments on the stability of the IR detector. Variations in IR dark current resulting from the changing environments during orbital cycling appear to be relatively small, amounting to a total difference in accumulated dark signal of ~18 e-/pixel over a 6-minute exposure. The variation in dark current appears to occur as a uniform shift in the dark rate per pixel. The raw zeroth- read signals are mildly correlated with WFC3 input voltage, but the effect is complicated by an unexpected systematic variation in the reset level from exposure to exposure that appears to be dependent on exposure history. The changes in bias level track well across all image quadrants and the amplitude of the drifts is significantly reduced, but not completely eliminated, by the calibration process. There is no indication of the type of quadrant-to-quadrant bias residuals seen in NICMOS images.
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