基于背照式CCD的微弱目标成像系统设计

摘要

为了对微弱目标进行探测,提出一种采用背照式CCD47 - 10为传感器的成像系统设计方案.通过对CCD47 - 10的工作原理和性能参数进行分析,完成电源模块、驱动模块、信号处理模块、数据传输模块的硬件设计.使用VHDL语言完成FPGA中的逻辑电路设计,使用VC++完成上位机软件设计.最后通过搭建实验系统,在微弱光下对光栅进行成像,并分析图像信噪比.实验结果表明,设计的系统在对微弱目标成像时信噪比为72,能够满足对微弱目标探测的应用要求.%In order to detect weak targets,a design scheme of imaging system based on back-illuminated CCD(BCCD) 47 - 10 is presented. By analyzing the principle and parameters of CCD47 - 10,the hardware circuit is designed. It is composed of power module, driver module, signal processing module and data transfer module. VHDL language is used to design the logic circuit. The PC software is programmed by VC + + . Finally, the experimental system is set up to image grating in dim light and the signal to noise ratio ( SNR) is 72. The result shows that the system can meet the requirement of weak targets detection.