科学级紫外CCD电路系统设计

Design of Scientific Grade Ultraviolet CCD Circuit System

为了获取高质量高帧频紫外图像数据,设计了一套基于科学级紫外CCD的成像电路系统。系统以CCD57-10图像探测器为核心,以FPGA-A3PE3000L为逻辑控制单元进行展开。首先,给出了设计方案,分析了CCD57-10的工作特性,设计了一套性能可靠的硬件电路;分析了CCD探测器的时序关系并确定了时序参数,采用了CCD开窗工作模式以提高帧频;在FPGA内完成了不同曝光时间的自适应。实验结果表明,在200 k Hz读出频率,256×256开窗条件下,系统帧频可达3 frame/s,读出噪声10个电子。

In order to obtain high quality and high frame frequency ultraviolet image,a set of scientific CCD imaging circuit system has been presented.The system takes E2V CCD57-10 as the image detector and uses A3PE3000L as logic control unit to complete the design.First of all,the main scheme of the system was given,then the work characteristics of the CCD57-10 was described and a better performance hardware circuit was design;The timing relationships of CCD was analyzed and the detailed timing parameters were determined.In order to optimize the frame frequency and detect sensitivity,CCD windowing design was adopted;Lastly,an improved CCD drive timing was used to adapt to different exposure time.Experimental results proved that when taking 200 kHz read frequency and 256×256 windowing,frame frequency of the system can reach 3 frame/s and noise equivalent signal of the whole circuit is less than 10 e-(electrons).