Computer Science
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007wfc..rept...21b&link_type=abstract
Instrument Science Report WFC3 2007-21, 19 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum Test, Uvis-2, Channel Glint
Scientific paper
The UVIS spare detector (UVIS build 2) was housed in WFC3 during the most recent epoch of thermal vaccum ground testing. We scanned the chip gap with a HeNe laser, to look for scattering from any material in the CCD chip gap or the edges of the CCD chips themselves. Although we found no such scattering issues, we did find a significant glint problem involving reflection from the surface of the CCD to the CCD housing and back down to the CCD. The glint appears as a large streak, ~10,000 pixels in area, containing anywhere from 1% to 30% of the energy within the source itself, depending upon the wavelength and position of the source. Approximately 10% of the detector area leads to glint when a source is placed in that area. Although any one glint comprises a tiny fraction of the detector area, the glint sweeps over a large area as the source is moved, implying that approximately 15% of the detector could be significantly illuminated by glint when observing a crowded field. As a result, the UVIS detectors currently not installed in the instrument have been modified to mask the surfaces responsible for the glint, to avoid this issue on orbit.
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