Predictive model of persistence in H2RG detectors

Abstract

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 $\mu$m and two 5.3 $\mu$m cutoff wavelength Teledyne H2RG detectors. We have developed a behaviour model of these traps using a 5-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.

arXiv commentAccepted for publication in Journal of Astronomical Telescopes, Instruments, and Systems

References in corpus (3)

• Reciprocity Failure in HgCdTe Detectors: Measurements and Mitigation
• Understanding Persistence: A 3D Trap Map of an H2RG Imaging Sensor
• Persistence Characterisation of teledyne H2RG detectors

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• Euclid preparation. Overview of Euclid infrared detector performance from ground tests
• Pyxel: the collaborative detection simulation framework
• Performance of the image persistence model for Euclid infrared detectors