Persistence and count-rate nonlinearity in the HST WFC3 IR detector

Details Persistence and count-rate nonlinearity in the HST WFC3 IR detector Persistence and count-rate nonlinearity in the HST WFC3 IR detector

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7731e.106d&link_type=abstract

Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave. Edited by Oschmann, Jacobus M., Jr.; Clampin

Physics

1

Scientific paper

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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