为了实现高灵敏度紫外探测，基于600×500元紫外电荷耦合器件(Charge-Coupled Device, CCD) 图像传感器，创新性地运用软件开窗技术设计了一种基于数字时间延迟积分(Time Delay Integration, TDI)的 紫外成像系统。具体分析了成像系统的噪声来源以及TDI阶数M对成像系统信噪比的影响，并从理论上分析了 采用M阶数字TDI技术对成像系统信噪比的影响。然后详细介绍了在FPGA内部实现数字TDI算法的情况，并给 出了数据采集系统中的上位机交互流程。实验结果表明，基于数字TDI技术的紫外成像系统可以获得较 高的图像对比度和信噪比以及优良的成像质量。

To realize high sensitivity ultraviolet (UV) detection, a UV imaging system based on digital Time Delay Integration (TDI) is designed innovatively by using a software windowing technology on the basis of a 600×500 UV Charge Coupled Device (CCD) image sensor. The noise sources of the imaging system and the influence of M-stage digital TDI on the Signal-to-Noise Ratio (SNR) of the imaging system are analyzed in detail. The influence of M-stage digital TDI technology on the SNR ofthe imaging system is analyzed in theory. Then, the implementation of digital TDI algorithm within FPGA is presented in detail and the interaction process of the data collection system in PC is given. The experimental results show that the UV imaging system based on digital TDI technology can obtain higher image contrast, better SNR and excellent imaging quality.