高速高灵敏光纤传输EMCCD相机设计

Design of the High Speed High Sensitivity Fiber Transmission EMCCD Camera

针对高帧频摄像机灵敏度较低与无法远程实时传输的难题,本文采用EMCCD器件提高其灵敏度,并利用光纤通信与USB技术实现高帧频图像的远程实时传输与记录。文章详细介绍了基于EMCCD器件CCD60建立相机的一种方法。利用CPLD器件产生EMCCD控制时序及视频同步处理控制时序,采用集成器件与分立器件相结合的方式建立EMCCD垂直驱动电路,建立EMCCD工作环境;然后,采用具有CDS功能的集成器件对CCD视频信号进行数字化,获得高帧频数字图像数据;再使用CPLD器件与光传输编解码芯片结合的方式实现高速图像数据的远程实时传输,最后采用USB2.0技术实现高速数据的实时采集。系统像素分辨率128×128,最高帧频可达1000fps,能应用于低照度高速图像获取场合。

Since high flame rate camera faces the challenge of high sensitivity and real-time transmission, EMCCD sensor is applied to improve its sensitivity, and fiber communication and USB technology are used to solve long-distance acquisition problem. This paper introduces the design of a high speed camera based on a new EMCCD image sensor CCD60. The logic control sequence of the CCD and the simultaneous processing control sequence of video signal are designed based on a CPLD. Firstly, DS0026 clock driver ICs are used for the standard clocks and discrete circuit is used for fast pulsed high-voltage （multiplication） clock. Then, the CCD video signal is digitized by a special circuit with CDS function. The high frame rate image data is transmitted to long-distance acquisition hardware through fiber cables. Finally, The USB port image data acquisition hardware is designed which allows the images from the EMCCD to be acquired in real time. The resolution of the system is 128×128. In low-light-level conditions, the system is capable of operating at 1000 frame/s.