H2RG检测器的持久性预测模型
Predictive model of persistence in H2RG detectors
摘要：
红外杂化探测器在天文学中有着广泛的应用，而像的余辉会降低其性能。这导致残留图像可以在探测器中持续数小时，污染任何后续的低背景观测。一个不同但相关的问题是互易性故障，即检测器对低通量观测不太敏感。它表明，这两个问题可以解释为捕获和去捕获电流，移动电荷来回跨越耗尽区边界的光电二极管内的每个像素。这些陷阱已在一个2.5 $μ$ m和两个5.3 $μ$ m截止波长Teledyne H2 RG探测器中进行了表征。我们已经开发了一个行为模型，这些陷阱使用5极无限脉冲响应数字滤波器。该模型允许探测器中的捕获电荷不断计算任意曝光历史，提供了一个近实时的图像持久性校正。
英文摘要：
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 $μ$m and two 5.3 $μ$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.
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