Computer Science
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004wfc..rept...14h&link_type=abstract
Instrument Science Report WFC3 2004-14, 15 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Uvis Shutter
Scientific paper
Data taken during ambient and thermal vacuum testing have been used to examine shutter shading effects, shutter repeatability and to determine accurate exposure times for WFC3's UVIS channel. Long wavelength illumination resulted in observable fringing effects, somewhat hindering the search for the shutter shading effects. From these data, no shutter shading effects are seen down to the ~0.5% level Shutter accuracy was measured by comparing the countrates of long vs. short exposures. Ambient data showed exposure times which deviated from nominal by up to 7.7%. (0.5 sec exposures) Thermal vacuum data were much better, showing deviations of less than 2% at all exposure times. For datasets taken at a single exposure time, both ambient and thermal vacuum data show variations in exposure time of less than 1.5% in all cases except for one. (i.e. 5.3 msec variation in a set of 0.5 sec exposures) Nevertheless, this level of variability is larger than that specified by the CEI spec. Searches for a shutter side dependence revealed no correlation between shutter side and accuracy.
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