Schematics illustrating the position of the SAD aperture in TEM.įigure 3710b (a) shows the principle of magnifying an image (Normal-Mag mode). Furthermore, this aperture is also applied to reduce both the area and intensity of the beam contributing to a diffraction pattern.įigure 2761a. Figure 3710a shows the normal position of the SAD aperture in TEM columns. In this case, the SAD aperture is used to exclude parts of the area being viewed so that we can make sure the diffraction pattern originates from a small, specific area. Note that the image plane of the objective lens is also the first image plane In selected area diffraction (SAD) technique, an aperture (called selected area aperture) is introduced into the image plane of the objective lens to select an area so that we can limit the region which generates the diffraction pattern. This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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