10 August 2010 Persistence and count-rate nonlinearity in the HST WFC3 IR detector
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Abstract
We now know that the flux of a source measured with HgCdTe arrays is not a simple, linear function, but depends on the count-rate as well as the total number of counts. In addition to the count-rate non-linearity (and probably related to the same physical mechanism), HgCdTe detectors are also susceptible to image persistence. Most of the persistence image fades in a few minutes, but there is a longer-term component that can result in faint afterimages in the next orbit, approximately 45 minutes later. For sources saturated at ~100 times full-well, the afterimages can persist for hours afterwards. This report describes results from ground and on-orbit tests to characterize the persistence and the count-rate non-linearity in the WFC3 IR detector during its first year of operation.
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Susana Deustua, Knox S. Long, Peter McCullough, Adam G. Riess, John MacKenty, Randy Kimble, Sylvia M. Baggett, Bryan Hilbert, Robert J. Hill, Cheryl Pavlovsky, Larry D. Petro, "Persistence and count-rate nonlinearity in the HST WFC3 IR detector", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77313C (10 August 2010); doi: 10.1117/12.857582; https://doi.org/10.1117/12.857582
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