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3 September 2019 Predictive model of persistence in H2RG detectors
Simon Tulloch, Elizabeth George, ESO Detector Systems Group
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Infrared hybridized detectors are widely used in astronomy, and their performance can be degraded by image persistence. This results in remnant images that can persist in the detector for many hours, contaminating any subsequent low-background observations. A different but related problem is reciprocity failure whereby the detector is less sensitive to low flux observations. It is demonstrated that both of these problems can be explained by trapping and detrapping currents that move charge back and forward across the depletion region boundary of the photodiodes within each pixel. These traps have been characterized in one 2.5-μm and two 5.3-μm cutoff wavelength Teledyne H2RG detectors. We have developed a behavior model of these traps using a five-pole infinite impulse response digital filter. This model allows the trapped charge in a detector to be constantly calculated for arbitrary exposure histories, providing a near-real-time correction for image persistence.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2019/$28.00 © 2019 SPIE
Simon Tulloch, Elizabeth George, and ESO Detector Systems Group "Predictive model of persistence in H2RG detectors," Journal of Astronomical Telescopes, Instruments, and Systems 5(3), 036004 (3 September 2019).
Received: 23 December 2018; Accepted: 11 August 2019; Published: 3 September 2019

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