Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix
| The image of every electron lens in EMs (electron microscopes) is mathematically formed by a Fourier transformation from the lens front to the back focal plane. That means the spatial coordinates are transformed into their reciprocal values, being spatial frequency spectra theoretically. Those lenses are also called Fourier lens, Fourier transform lens, or Fourier transformation lens, reflecting the two dimensional Fourier transformation takes place.
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