科学级CCD远程图像采集系统设计

介绍了一种基于高分辨率超感光度（EXview）CCD的光纤远程传输采集系统的设计方法。该系统利用专用集成芯片实现其时序驱动;双复杂可编程逻辑器件(CPLD)完成系统的逻辑控制;采用带相关双采样的16位高精度模数变换器(ADC)对模拟视频进行数字化,从而提高系统动态范围。为满足其极端实验环境的应用,基于TLK1501进行大容量视频数据的远程传输;利用USB接口实现了计算机终端采集。最后,实验测试了系统的两个重要的评价参数：动态范围和系统灵敏度。该系统具有140万像素、16位高精度数字化位数、30 km以上的远程传输能力,其动态范围为1000~1500倍、灵敏度为2.34 ADU/e-左右,暗电流约为6 e-/pixel·s-1>32 ℃]。实验显示该系统适用于对分辨率、灵敏度、安全性等要求高的科学研究中。

Remote image acquisition system with scientific grade CCD

The design method of a fiber transmission remote image acquisition system based on a high resolution EXview CCD is presented and the main units in the system are introduced in detail. The system utilizes a special IC to achieve time driving and takes double Complex Programmable Logic Devices(CPLDs ) to complete the logic control. In order to improve dynamic ranges, it uses a 16 bit high resolution Digital to Analog Converter(ADC) to digitalize video signals. Furthermore, the system can transfer mass video data in long-distances based on the TLK1501,and can perform data terminal collection with a computer by a USB. Finally, two important parameters: dynamic range and the system gain are estimated in an experiment. The system offers its specifications are a resolution of 1.4 million pixels, digitizer type of 16 bits, and remote transmission less than 30 km. Moreover, its dynamic range is 60-65 dB,system gain is 2.34 ADU/e-. Experiments show that designed system is fit for the science research which demands for the best quality mentioned above.