Physics
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept...25h&link_type=abstract
Instrument Science Report WFC3 2005-25, 41 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
During the 2004 thermal vacuum testing campaign, a series of tests were performed in order to analyze the dark current behavior of the WFC3's IR channel with the FPA64 detector. These tests included investigations of the dark current levels during each of the IR channel's readout sample sequences as well as dark current variations between nominal and non-nominal operating temperatures. For most sample sequences, the measured dark current at nominal operating temperature (150 K) was ~0.10-0.21 e-/sec/pix. This value is a factor of 3-5 larger than the FPA-only dark current of ~0.04 e-/sec/pix measured at the Detector Characterization Laboratory (DCL) earlier in the year, (DCL, 2003) but includes the thermal contribution from the cold enclosure. The total dark current signal therefore, meets the CEI Specification of 0.4 e-/sec/pix, and the goal of 0.20 e-/sec/pix. The data also revealed some unexpected effects, including a cyclical variation of dark current correlated with cold enclosure temperature and TEC voltage, as well as bad pixel masks that change with time.
Hilbert Bryan
Robberto Massimo
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