Results of WFC3 Thermal Vacuum Testing - Repeatability of the Channel Select Mechanism

Details Results of WFC3 Thermal Vacuum Testing - Repeatability of the Channel Select Mechanism Results of WFC3 Thermal Vacuum Testing - Repeatability of the Channel Select Mechanism

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept...18b&link_type=abstract

Instrument Science Report WFC3 2005-18, 2 pages

Physics

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

Scientific paper

The channel select mechanism (CSM) on WFC3 is used to divert the optical path of the incoming beam to the WFC3 IR channel. The contract end item (CEI) specification for the CSM is that the position of point sources in the IR channel should vary by less than 20 milliarcsec after movement of the CSM. 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. Some of these tests involved rapid switching between the WFC3 channels to track the image stability over large slews in temperature. These data imply that the CSM meets its CEI specification for repeatability.

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