CCD的非线性与频谱混叠的关系研究

Study of the Relationship Between Nonlinearity of CCD and Frequency Overlapping

分析了CCD的非线性产生频谱混叠问题,提出了减小频谱混叠的方法.从理论上分析了CCD的非线性产生高频分量的原因,给出了简单的物理解释和解析推导.通过计算机仿真与实验两种方法得出了CCD的非线性导致频谱混叠的结果,再通过计算机仿真方法得出结论:在存在高级次频谱成份的情况下,加密抽样可减少频谱混叠并明显提高FTP的测量准确度.

The overlapping spectrum caused by the nonlinearity of CCD was analyzed,and the way of reducing overlapping spectrum was presented.The cause to high order spectrum produced by the nonlinearity of CCD was analyzed through theory.The simple physical explain and analytical deduction was given,and also results of overlapping spectrum were given through simulation of computer and experiment.The results of simulation of computer show that the measurement precision of FTP can be improved obviously by denser sampling.