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Convex Electromagnetic Lens
- Practical Electron Microscopy and Database -
- An Online Book -
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https://www.globalsino.com/EM/
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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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A current through a set of windings can generate strong magnetic field. This field acts as a convex lens in electron microscopes, bringing off axis rays back to focus. The image is rotated to a degree that depends on the strength of the lens. Focal length can be altered by changing the strength of the current.
Figure 4950. Convex Electromagnetic Lens
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