dark-field image
dark-field image
An image that is produced by one diffracted wave in a diffraction pattern formed on the back focal plane of the objective lens, using the objective aperture. A location in the image, where the selected diffracted wave takes place, appears bright. The dark-field image, together with the bright-field image, is used for analysis of lattice defect and measurement of specimen thickness.
Fig. Dark-field image of lattice defects (dislocation lines) in an FeAl alloy.
The image was taken with a diffraction spot (indicated by an arrow) of the lower-right diffraction pattern at satisfying the Bragg diffraction condition only at the dislocation lines. Thus, the dislocation lines appear bright.
Fig. Dark-field image of lattice defects (dislocation lines) in an FeAl alloy.
The image was taken with a diffraction spot (indicated by an arrow) of the lower-right diffraction pattern at satisfying the Bragg diffraction condition only at the dislocation lines. Thus, the dislocation lines appear bright.
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