摘要
星载差分吸收成像光谱仪通常运行于太阳同步轨道,探测地表反射光的光谱并根据特征气体的谱线吸收强度测量区域内某些痕量气体浓度。第一代星载差分吸收光谱仪受限于探测器性能等原因,探测的动态范围不大,造成暗背景下数据信噪比低,亮背景下像元饱和。随着更大阱深,更高速度的探测器出现,第二代高动态范围的差分吸收成像光谱仪得以实现。本文介绍了高动态范围的差分吸收光谱仪成像电路的研制过程,包括器件选型,电路方案及电路测试,并对测试结果进行了分析。重点讨论了高动态范围的实现,给出了单点测量值的概念,提出了最大单点测量值的计算公式,解释了最大单点测量值与动态范围的关系,并评估了探测器件的单点探测能力,同时规划了未来进一步提高动态范围的方法,从而为同类设备的研制提供参考。
Satellite-borne imaging Differential Optical Absorption Spectrometers typically operate in a po⁃lar,sun-synchronous orbit,capturing reflected light from the Earth to measure gas concentrations via ab⁃sorption intensities at specific spectral lines.First-generation instruments often suffer from low dynamic range,leading to signal saturation in bright areas and insufficient readings in dim ones.The advent of ad⁃vanced image detectors with deeper full-well capacities and higher readout frequencies allows for the devel⁃opment of second-generation high-dynamic range instruments.This article details the design and implemen⁃tation of the imaging circuit for a high-dynamic range Satellite-borne imaging Differential Optical Absorp⁃tion Spectrometer,including detector selection,design strategies,and real circuit testing and analysis.The article elaborates on high-dynamic range design,introduces the concept of maximum measurement value for a single point along with its calculation formula,analyzes the relationship between maximum sin⁃gle-point measurement value and dynamic range,and offers a method for evaluating detection capability in single-point measurements.Additionally,the article presents a strategy to further enhance dynamic range and serves as a reference for R&D in similar applications.
作者
王煜
陆亦怀
周海金
司福祺
刘国华
常振
林方
刘文清
WANG Yu;LU Yihuai;ZHOU Haijin;SI Fuqi;LIU Guohua;CHANG Zhen;LIN Fang;LIU Wenqing(Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Information Materials and Intelligent Sensing Laboratory of Anhui Province,Anhui University,Hefei 230601,China;Key Laboratory of Environmental Optical and Technology,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2024年第13期2017-2028,共12页
Optics and Precision Engineering
基金
国家重点研发计划资助项目(No.2019YFC0214702,No.2022YFC3700102)。
关键词
差分吸收光谱仪
CCD成像电路
高动态范围
卫星载荷
differential optical absorption spectrometer
CCD imaging circuit
high dynamic range
satel⁃lite-borne instrument
