上斜坡读出探测器的最佳拟合和去锯齿化

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Timothy D. Brandt
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引用次数: 0

摘要

本文推导了在存在读取噪声和光子噪声的情况下,理想探测器非破坏性读出时像素计数率的最佳拟合。该方法适用于任何读出方案,可提供所有量的闭式表达式,计算成本与结果数(读数组)成线性关系。我还通过估计协方差矩阵推导出拟合偏差,并展示了如何将其去除到一阶。我所描述的斜坡拟合算法提供了一条直线与累积计数拟合的 χ2 值,这可以解释为拟合优度指标。我提供并描述了这些算法的纯 Python 实现,它可以在 2020 Macbook Air 的单核上,在 ≈8 秒内处理 4096 × 4096 探测器上的 10 个结果斜坡,并去除偏差。该 Python 实现以及测试和教程笔记本可在 https://github.com/t-brandt/fitramp 上获取。另一篇论文介绍了基于斜坡拟合假设检验的跃迁检测算法,并在 JWST 的数据上演示了所有算法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimal Fitting and Debiasing for Detectors Read Out Up-the-Ramp
This paper derives the optimal fit to a pixel’s count rate in the case of an ideal detector read out nondestructively in the presence of both read and photon noise. The approach is general for any readout scheme, provides closed-form expressions for all quantities, and has a computational cost that is linear in the number of resultants (groups of reads). I also derive the bias of the fit from estimating the covariance matrix and show how to remove it to first order. The ramp-fitting algorithm I describe provides the χ2 value of the fit of a line to the accumulated counts, which can be interpreted as a goodness-of-fit metric. I provide and describe a pure Python implementation of these algorithms that can process a 10-resultant ramp on a 4096 × 4096 detector in ≈8 s with bias removal on a single core of a 2020 Macbook Air. This Python implementation, together with tests and a tutorial notebook, are available at https://github.com/t-brandt/fitramp. A companion paper describes a jump detection algorithm based on hypothesis testing of ramp fits and demonstrates all algorithms on data from JWST.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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