Detectors that use HgCdTe exhibit Count Rate Non-Linearity (CRNL), where the integrated photon-generated charge in a pixel has an undesirable variation with photon arrival rate, at fixed delivered photon dose. Correcting for this is essential to meet the science goals of the Roman Space Telescope. The CRNL effect is distinct from signal-level-dependent (but photon-rate-independent) nonlinearity. We describe a potential method for measuring CRNL, by illuminating the sensor with two modulated light sources running at different frequencies, f 1 and f 2 . The CRNL-modified generation of photocharge in the material produces a variation in the accumulated charge versus time with Fourier components at the beat frequencies ( f 1 − f 2 ) and ( f 1 + f 2 ). Successive non-destructive read-up-the-ramp measurements could perhaps be used to quantify CRNL, and distinguish it from nonlinearit...

中文翻译：

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基于信号互调的探测器计数率非线性确定

使用HgCdTe的检测器表现出计数率非线性（CRNL），其中在固定的输送光子剂量下，像素中累积的光子产生的电荷随光子到达率发生不希望的变化。对此进行校正对于满足罗马太空望远镜的科学目标至关重要。CRNL效应不同于依赖信号电平（但不依赖光子速率）的非线性。我们描述了一种通过两个以不同频率f 1和f 2运行的调制光源照射传感器来测量CRNL的潜在方法。材料中CRNL修饰的光电荷的产生会在拍频（f 1-f 2）和（f 1 + f 2）时，随着傅立叶分量的变化，累积电荷随时间变化。连续的非破坏性的匝道读取测量可能可以用来量化CRNL，