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Glossary terms about Secondary Electron Image

Secondary Electron Image (SEI)
The image that is obtained from secondary electrons that are reflected from a specimen. The image contrast depends on surface roughness, profile of sample and sample composition.

5 pages mention Secondary Electron Image

Magnetic lens system
An optimal aperture diameter should be selected for obtaining high resolution secondary electron images. 
Recommended reading
Sample preparation
SEM challenge
This is a secondary electron image taken at 25kV. 
Troubleshooting: edge effect, charging, sample damage
Charging is produced by build-up of electrons in the sample and their uncontrolled discharge, and can produce unwanted artefacts, particularly in secondary electron images.