WFC3 TV2 Testing: IR Channel Read Noise

Details WFC3 TV2 Testing: IR Channel Read Noise WFC3 TV2 Testing: IR Channel Read Noise

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept....4h&link_type=abstract

Instrument Science Report WFC3 2008-04, 12 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum 2, Tv2, Ir Channel, Read Noise

Scientific paper

Using data taken during WFC3's Thermal Vacuum 2 (TV2) testing campaign, we have characterized the readnoise behavior in the IR Channel, which contained IR-1 (FPA129). Data were taken at FPA temperatures of -123°C and -125.4°C, while the nominal onorbit operating temperature of the IR channel is -128°C. At the lower of the two FPA temperatures, correlated double sampling (CDS) readnoise values varied by quadrant between 15.6 and 19.5 - e. Each quadrant appeared to have different temperature sensitivity, with the readnoise value in quadrant 4 changing by over 1 - e for the 2.4-°C temperature change, versus a change of only 0.1 - e for quadrant 1. By combining all 16 reads of a given ramp into a final image, we found values of effective noise between 9.1 - 13.0 - e at -125.4°C.

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