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Design of a Low Noise Area Array CCD Imaging System for Exoplanet Search

机译：用于Exoplanet搜索的低噪声区域阵列CCD成像系统的设计

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摘要

The search for exoplanets is a focal topic in astronomy. Since the signal from the detected target is very weak, the imaging system needs to have ultra-low readout noise. Therefore, a low noise charge-coupled diode (CCD) imaging system for exoplanet search (LNCIS) is proposed. Based on the area array CCD (TH7888A), the circuit and timing drive of LNCIS are designed. Especially, the application of correlation dual sampling (CDS) and asynchronous first-in, first-out (FIFO) memory can effectively suppress the correlation noise of the image signal. Moreover, this article proposes a fully differential double correlation sampling method, which can achieve better sampling effect and can better eliminate common-mode noise, improve dynamic range, and achieve high-quality image signal output. In addition, an independent counting method for adjusting the exposure time is proposed, which satisfies the requirements of the long exposure time of the imaging system, so that the CCD can be provided an independent and adjustable exposure time in the photosensitive stage. The LNCIS uses the FPGA (ZYNQ7000) as the core control device to produce the timing according to the function of the system. Finally, the experimental results show that the real-time image acquisition is achieved under the condition that the CCD readout clock frequency is 20 MHz. It is verified that the circuit and timing drive of the imaging system can meet the design requirements. (C) 2020 Society for Imaging Science and Technology.
机译：寻找Exoplanets是天文学的焦点主题。由于来自检测目标的信号非常弱，因此成像系统需要具有超低读出噪声。因此，提出了一种用于Exoplanet搜索（LNCIS）的低噪声电荷耦合二极管（CCD）成像系统。基于区域阵列CCD（TH7888A），设计了LNCIS的电路和定时驱动。特别地，相关性双采样（CD）和异步首先应用的应用，优先突出（FIFO）存储器可以有效地抑制图像信号的相关噪声。此外，本文提出了一种全差异的双相关采样方法，可以实现更好的采样效果，可以更好地消除共模噪声，改善动态范围，实现高质量的图像信号输出。另外，提出了一种用于调整曝光时间的独立计数方法，其满足成像系统的长曝光时间的要求，使得CCD可以在光敏阶段提供独立和可调节的曝光时间。 LNCIS使用FPGA（Zynq7000）作为核心控制装置，以根据系统的功能来产生定时。最后，实验结果表明，在CCD读出时钟频率为20MHz的条件下实现了实时图像采集。验证了成像系统的电路和定时驱动器可以满足设计要求。 （c）2020年影像科技协会。

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  • 来源
    《Journal of Imaging Science and Technology》 |2020年第3期|30504.1-30504.9|共9页
  • 作者

    Di Lamei; Liu Hong; Wei Ruyi; Qiao Nianzu; Chen Shasha;

  • 作者单位

    Chinese Acad Sci Xian Inst Opt Precis Mechan Xian 710119 Peoples R China|Chinese Acad Sci Key Lab Spectral Imaging Technol Xian 710119 Peoples R China;

    Chinese Acad Sci Xian Inst Opt Precis Mechan Xian 710119 Peoples R China|Chinese Acad Sci Key Lab Spectral Imaging Technol Xian 710119 Peoples R China|Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian 710049 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Xian Inst Opt Precis Mechan Xian 710119 Peoples R China|Chinese Acad Sci Key Lab Spectral Imaging Technol Xian 710119 Peoples R China;

    Northwest Univ Sch Informat Sci & Technol 1 Xuefu Ave Xian 710127 Peoples R China;

    Chinese Acad Sci Xian Inst Opt Precis Mechan Xian 710119 Peoples R China|Chinese Acad Sci Key Lab Spectral Imaging Technol Xian 710119 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

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