WFC3 TV3 Testing: IR Channel Read Noise

Details WFC3 TV3 Testing: IR Channel Read Noise WFC3 TV3 Testing: IR Channel Read Noise

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept...25h&link_type=abstract

Instrument Science Report WFC3 2008-25, 16 pages

Physics

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

Scientific paper

Using data taken during WFC3's Thermal Vacuum 3 (TV3) testing campaign, we have characterized the readnoise behavior in the IR Channel, which contained IR-4 (FPA165). The Contract End Item (CEI) Specifications call for a correlated double sampling (CDS) readnoise of 15 e-, along with an achievable readnoise of 10 e- from a ramp of 10 nondestructive reads. We observe a CDS readnoise of roughly 20.3 - 21.0 e-, and an effective readnoise of 8.5 - 17 e- for 16 non-destructive reads, depending on sample sequence. The IR channel meets the spec for achievable readnoise only when using the MIF sample sequences and a line-fitting data reduction technique.

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