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Electrons of all energies scattered from the sample form a background to the diffraction pattern, which reduces the contrast of the Kikuchi bands.

The background intensity can be removed to improve the visibility of the Kikuchi bands. The background can be measured by scanning the beam over many grains in the sample to average out the diffraction information.

Figure 3 Background removal from a diffraction pattern of Austenitic steel.

Background

(a) Background.

Original pattern

(b) Original pattern.

Pattern after background subtraction

(c) Pattern after background subtraction.

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