设计了一种基于FPGA+NIOSⅡ的背照式CCD成像系统。系统采用半导体制冷器对CCD芯片致冷,大幅降低了CCD芯片的暗电流,从而使相机具有很高的灵敏度和很低的读出噪声特性。图像数据传输采用TCP/IP协议接口,可以进行远距离网络控制。详细介绍了系统的硬件设计、制冷系统结构设计,以及相关软件设计。 A back-illuminated CCD imaging system based on FPGA + NIOS Ⅱ is designed. The system uses a semiconductor cooler to cool the CCD chip, drastically reducing the dark current of the CCD chip, giving the camera high sensitivity and low readout noise. Image data transmission using TCP / IP protocol interface, you can remote network control. Described in detail the system hardware design, refrigeration system structure design, and related software design.