【摘要】 为提高CCD采集的光栅莫尔条纹信号质量,采用相关双采样法对CCD采集的莫尔条纹信号进行噪声处理,通过对相关双采样原理进行建模和仿真,验证了此方法在噪声相关程度越大的情况下,对噪声的抑制越好。采用一款内部带有相关双采样电路的AD转换器对CCD输出信号进行采集,使用FPGA产生CCD驱动时序、AD驱动时序和配置时序。使用Verilog HDL语言和Quartus II软件进行时序程序编写和仿真,仿真结果表明了设计的正确性,因此相关双采样去噪法可以应用在莫尔条纹的采集系统中以提高莫尔条纹的信号质量。更多还原

【Abstract】 In order to improve the grating Moiré fringe quality collected with CCD,correlated double sampling(CDS)was used to remove the noise of CCD output signal.Modeling and simulation results of CDS theory show the better the noise suppression effect is,the more the noise correlation degree is.An AD converter with internal CDS circuit samples the CCD output signal.FPGA generates the CCD driving timing,AD driving timing and configuration timing.It adopted Verilog HDL language and Quartus Ⅱ software to program timing programming and simulation.The simulation results show design is correct,so CDS method can be used in Moiré fringe collection system to improve the signal quality.更多还原