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10 August 2010 Persistence and count-rate nonlinearity in the HST WFC3 IR detector
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Susana Deustua, Knox S. Long, Peter McCullough, Adam G. Riess, John MacKenty, Randy Kimble, Sylvia M. Baggett, Bryan Hilbert, Robert J. Hill, Cheryl Pavlovsky, and 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);


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