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27 August 2024 Fast resets of sub-windows on infrared detectors as a strategy for persistence mitigation
Edward L. Chapin, Theodore Grosson, Tim Hardy, Jordan Lothrop
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Proceedings Volume 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI; 131031R (2024) https://doi.org/10.1117/12.3019318
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
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Abstract
Persistence effects in HgCdTe infrared detectors cause significant artifacts that can impact the quality of science observations for up to many hours after exposure to bright/saturating sources. This problem will have a substantially greater impact on viable observing modes for infrared cameras on future ELTs due to the leap in sensitivities that is expected. In this paper we present new results from an updated test system that was previously used to prototype “on-detector guide windows” to provide fast T/T feedback to AO systems, interleaved with simultaneous (slow) full-frame readouts for science. We now explore the possibility of continuously resetting these small regions of the detector that are illuminated with a compact source as a strategy for mitigating persistence, using two different detectors. While our results generally show promise for this observing strategy, we found for one of our detectors that the combination of fast localized resets with intense illumination can introduce a potentially problematic persistent change in local reset levels.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Edward L. Chapin, Theodore Grosson, Tim Hardy, and Jordan Lothrop "Fast resets of sub-windows on infrared detectors as a strategy for persistence mitigation", Proc. SPIE 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI, 131031R (27 August 2024); https://doi.org/10.1117/12.3019318
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KEYWORDS
Sensors
Light sources and illumination
Infrared detectors
Infrared Imaging Spectrograph
James Webb Space Telescope
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