时间延迟积分型面阵CMOS图像传感器MTF速度失配模型研究

研究了时间延迟积分型面阵互补金属氧化物半导体(CMOS)图像传感器调制传递函数(MTF)速度失配特性,在分析累加级数、像素尺寸、镜头放大倍数、行周期及电机运动速度失配等影响因素的基础上,建立了MTF速度失配模型。基于现场可编程门阵列(FPGA)开发板,搭建面阵CMOS图像传感器实现线阵时间延时积分(TDI)的CMOS测试系统。实验结果表明,在光强为3lx,速度失配M(ΔV/V)<2,8级时间延迟积分与面阵成像相比,MTF值提高50%;当累加级数为8级,速度失配满足M(ΔV/V)=2的速度失配容限时,奈奎斯特频率处的MTF值下降10%,当速度失配达到M(ΔV/V)=10时,MTF值下降35%。

Research of MTF Velocity Mismatch Model for Time Delay Integration CMOS Area Image Sensors

Modulation transfer function (MTF) velocity mismatch feature for time delay integration (TDI) complementary metal-oxide-semicoductor (CMOS) area image sensors is studied. A model of MTF velocity mismatch is proposed. The effecting factors such as accumulation stage, pixel size, lens magnification, line cycle, motor velocity are analyzed. A TDI algorithm for CMOS area image sensor is applied to achieve time delay integration. The TDI-CMOS system is developed based on a FPGA development board. The experimental results show that fMTF increases 50% by 8 accumulation stage compared to CMOS area sensor, when the intensity is 3 lx and velocity mismatch M(ΔV/V) is less than 2. The fMTF at the Nyquist frequency decreases 10% by 8 accumulation stage, when the velocity mismatch M(ΔV/V)=2. When the velocity mismatch M(ΔV/V)=10, the fMTF decreases 35%.