LabAdviser/314/Microscopy 314-307/Postprocessing/Lattice fringes: Difference between revisions
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At times, it is easier to measure lattice space distances using Fast Fourier Transforms (FFTs). With the image of interest as active press Ctrl F in order to get an FFT of the image (see below): | At times, it is easier to measure lattice space distances using Fast Fourier Transforms (FFTs). With the image of interest as active press Ctrl F in order to get an FFT of the image (see below): | ||
[[File:Lattice-fringes_reciprocal_1.png|600px|thumb|left|Fig. 3:FFT of HRTEM image.]] | [[File:Lattice-fringes_reciprocal_1.png|600px|thumb|left|Fig. 3:FFT of HRTEM image.]]<br clear="all" /> | ||
The complex FFT is by default shown as the logarithm of the modulus. The FFT is calibrated so it is possible to measure the lattice space distances directly by measuring the distance between the dominant Fourier components. | The complex FFT is by default shown as the logarithm of the modulus. The FFT is calibrated so it is possible to measure the lattice space distances directly by measuring the distance between the dominant Fourier components. | ||