Nonlinearity Corrections and Statistical Uncertainties Associated with Near‐Infrared Arrays
Nonlinearity Corrections and Statistical Uncertainties Associated with Near‐Infrared Arrays
复制标题
与近红外阵列相关的非线性校正和统计不确定性
DOI：
10.1086/382906
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发表时间：
2004
影响因子：
3.5
通讯作者：
J. Rayner
中科院分区：
文献类型：
--
作者：
W. Vacca;M. Cushing;J. Rayner
我们推导了非线性校正和统计不确定性（方差）估计的一般方程，这些数据是由近红外探测器采用相关双采样、多重相关双采样（福勒采样）和均匀间隔连续读出技术获得的。我们将福勒采样相关的每个像素方差方程与安装在NASA红外望远镜设施的近红外交叉分散光谱仪（SpeX）阵列上的数据进行了比较，发现它提供了经验结果的准确表示。该比较还揭示了与SpeX阵列的单个读出相关的读取噪声随着非破坏性读取次数的增加而增加，为n0.16r。这意味着存储图像的有效读噪声随n-0.34r下降，低于n-0.5r的预期速率。这种读取噪声行为的原因尚不确定，但可能是由于多次读取导致阵列加热。这种行为对于使用相关或多个相关双采样读出的数组可能是通用的。
We derive general equations for nonlinearity corrections and statistical uncertainty (variance) estimates for data acquired with near‐infrared detectors employing correlated double sampling, multiple correlated double sampling (Fowler sampling), and uniformly spaced continuous readout techniques. We compare our equation for the variance on each pixel associated with Fowler sampling with data taken with the array installed in the near‐infrared cross‐dispersed spectrograph (SpeX) at the NASA Infrared Telescope Facility and find that it provides an accurate representation of the empirical results. This comparison also reveals that the read noise associated with a single readout of the SpeX array increases with the number of nondestructive reads, nr, as n0.16r. This implies that the effective read noise of a stored image decreases as n-0.34r, shallower than the expected rate of n-0.5r. The cause of this read noise behavior is uncertain but it may be due to heating of the array as a result of the multiple readouts. Such behavior may be generic to arrays that employ correlated or multiple correlated double sampling readouts.