In order to reduce the influence of the mixing and overlap of frequency spectrum on the calculated result in the calculation of the fast Fourier transform (FFT) of diffraction,the interval of sampling should be taken to be as small as possible.However,a many number of sampling leads to great difficult in general to FFT program with finite computer memory.In this paper,a error trace calculation methd is proposed based on the study of the mixing and overlap energy of frequency spectrum and the Fresnel diffraction integral.Using our method,the FFT program needs a little of computer memory to finish the calculation of Fresnel diffraction with the arbitrary interval of sampling and the demanded precision.This method can be extended conveniently to Collins formula.
Discussion(0)
No comments yet. Be the first to comment.