Results of WFC3 Thermal Vacuum Testing - Image Stability

Details Results of WFC3 Thermal Vacuum Testing - Image Stability Results of WFC3 Thermal Vacuum Testing - Image Stability

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept...11b&link_type=abstract

Instrument Science Report WFC3 2005-11, 18 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

As part of the 2004 campaign of WFC3 thermal-vacuum tests, the image stability of both WFC3 channels (UVIS & IR) was measured over a wide range of environmental temperatures, simulating thermal variations that could occur in flight due to orbital occultations and slewing between hot and cold orientations. During orbital temperature cycles, the drift in the UVIS channel slightly exceeded its specification of 10 milliarcsec per 200 minutes, while the drift in the IR channel met its specification of 20 milliarcsec per 200 minutes. During large temperature slews, the UVIS channel drift exceeded its specification by a factor of 6, while the IR channel drift exceeded its specification by a factor of 3, and the alignment of the two channels diverged significantly. Alternative versions of these tests showed that much of this motion may be associated with the test apparatus instead of WFC3, but this is still under investigation.

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