WFC3 TV2 Testing: UVIS Shutter Stability and Accuracy

Details WFC3 TV2 Testing: UVIS Shutter Stability and Accuracy WFC3 TV2 Testing: UVIS Shutter Stability and Accuracy

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007wfc..rept...17h&link_type=abstract

Instrument Science Report WFC3 2007-17, 8 pages

Computer Science

Performance

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Tv2 Test, Thermal Vacuum 2 Test

Scientific paper

Images taken during WFC3's Thermal Vacuum 2 (TV2) testing have been used to characterize the performance of the UVIS channel shutter. Images with exposure times ranging from 0.5 to 30 seconds have been used to examine shutter shading, accuracy, and repeatability. Fits to ratio images reveal no shutter shading effects down to the 0.77% level, corresponding to an exposure time difference across the image of no more than 0.004 sec (CEI Spec is 0.01 sec). Measured exposure times are within 2.4% of commanded values in all cases except the 0.5 second images. Similar to results from TV1, these data show the UVIS shutter fails to meet the CEI Spec for shutter repeatability in 5 of the 9 commanded exposure times.

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