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介绍了一种高灵敏度制冷型科学级CCD相机的设计方法。相机利用FPGA芯片实现时序驱动、相机控制及传输数据;设计了相关双采样电路来降低相机的复位噪声;数据由以太网接口芯片W5300通过TCP/IP协议发送到图像采集软件显示和处理。相机采用半导体制冷器结合水冷的方法进行制冷。实验结果表明,在相机制冷到-20℃时,最低照度可达到0.005Lx,具有灵敏度高的特点,能够满足弱光环境中的使用需求。
A design method of a CCD camera with high sensitivity and refrigeration is introduced. The camera uses FPGA chip to realize timing control and camera control and data transmission. The relevant double sampling circuit is designed to reduce the camera’s reset noise. The data is sent to the image acquisition software for display and processing by Ethernet interface chip W5300 through TCP / IP protocol. The camera uses a semiconductor cooler combined with water cooling method. Experimental results show that when the camera is cooled to -20 ℃, the minimum illumination can reach 0.005Lx, which has the characteristics of high sensitivity and can meet the needs of using in low light environment.