FFT, Diffraction and Interference from N slits.
Here, the diffraction pattern from a set of N 1 dimensional slits is found using the FFT. The patterns are just the FFT of the sampled transmission coefficient(1 in slit, 0 between and outside slits).
The FFT is shown in the applet below. The number of slits,
width of each slit and separation of the slits can be varied by
sN, sW, sS respectively with the numbers being given in samples.
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COPYRIGHT © 2007 Cuthbert Nyack.