scanning electron microscope
Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.
Related to scanning electron microscope: Transmission electron microscope
scanning electron microscope[′skan·iŋ i′lek‚trän ′mī·krə‚skōp]
A type of electron microscope in which a beam of electrons, a few hundred angstroms in diameter, systematically sweeps over the specimen; the intensity of secondary electrons generated at the point of impact of the beam on the specimen is measured, and the resulting signal is fed into a cathode-ray-tube display which is scanned in synchronism with the scanning of the specimen. Abbreviated SEM.