Definitions for "Scanning Electron Microscope"
A type of microscope using a beam of electrons rather than visible light.
Scanning electron microscopes are scientific instruments that use a beam of highly energetic electrons to examine objects on a very fine scale. This examination can yield the following information: topography, morphology, composition, and crystallographic Information
SEM is an electron microscope in which a beam of electrons is focused and moved across an object. The secondary electrons produced by the object and the electrons scattered by the object are collected and form a three-dimensional image on a cathode-ray t ube. For more information on this device, see this site.