Digital binning method for CCD pixels and its applications

Zhen CHANG; Fu-qi SI; Hai-jin ZHOU; Min-jie ZHAO; Wen-qing LIU

doi:10.3788/OPE.20172508.2204

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Digital binning method for CCD pixels and its applications

Information Sceiences | 更新时间：2020-07-07

- Digital binning method for CCD pixels and its applications
- Optics and Precision Engineering Vol. 25, Issue 8, Pages: 2204-2211(2017)
- 作者机构：
  
  1.中国科学院安徽光学精密机械研究所, 安徽合肥 230031
  2.中国科学技术大学, 安徽合肥 230026
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172508.2204
  CLC： TP73;TN386.5
- Received：09 February 2017，
  
  Accepted：01 April 2017，
  
  Published：25 August 2017
- 稿件说明：
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Zhen CHANG, Fu-qi SI, Hai-jin ZHOU, et al. Digital binning method for CCD pixels and its applications[J]. Optics and precision engineering, 2017, 25(8): 2204-2211.
DOI：

Zhen CHANG, Fu-qi SI, Hai-jin ZHOU, et al. Digital binning method for CCD pixels and its applications[J]. Optics and precision engineering, 2017, 25(8): 2204-2211. DOI： 10.3788/OPE.20172508.2204.

摘要

星载差分吸收光谱仪中的科学级帧转移型电荷耦合器件（CCD）通常使用四行像元合并（4-Binning）方法提升载荷的信噪比，但该方法仅能工作在目标光强较弱的环境。为使载荷适应目标光线较强的环境，设计了数字像元合并方法（4-AVR）来提升载荷的探测能力。考虑相对常规的4-Binning方法，4-AVR方法会产生CCD信号衰减现象，故对这一现象进行了理论分析，得到由于CCD读出速率导致的信号衰减系数为0.699。在实验室搭建了测试装置，验证了上述结果，结果表明，4-AVR方法下获取的CCD像素值相对于4-Binning方法获取的像素值的衰减系数为0.698，从而证实了理论分析的正确性。实验显示，使用这一系数可完成对4-AVR方式下获取的像素值的校正，从而实现两种方法的无差别化。将校正方法作为载荷一级数据处理的一部分，进行了大气痕量气体的反演测试。结果表明数字像元合并方法可保证大气痕量气体的反演精度，进一步验证了数字像元合并方法的可靠性。

Abstract

Scientific grade frame-transfer Charged Coupled Devices(CCDs) in a space-borne differential optical absorption spectrometer usually use a Pixel Binning (4-Binning)method to improve its Signal-to-Noise Ratios(SNRs). It is only suitable for the quite weak radiation. To allow the spectrometer to be used for stronger radiation and to expand its detection ability

a digital pixel binning method

4-AVR

was designed. Comparing to the 4-Binning method

this 4-AVR method brings the attenuation of CCD signals. Therefore

the attenuation was researched theoretically

and a signal attenuation coefficient 0.699 due to the CCD signal readout speed was obtained. Then

testing devices were built in the lab to get the data of pixel values of CCD in both 4-Binning and 4-AVR methods. The result shows that the attenuation coefficient of CCD pixel values is 0.698

which verifies the theoretical result. The experiment demonstrates that the coefficient can be used to correct the pixel values gained in the4-AVR method to implement the consistency of two methods. By taking the correction as a part of 1-B data processing

the tests of atmospheric trace gases were retrieved

and results indicate that the method ensures the quantitatively data of the space-borne spectrometer

which verifies the reliability of the method.

关键词

Keywords

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