(in mechanical scanning) a disk with a line of holes spiraling in from its edge, rotated in front of a surface so as to expose a small segment as each hole passes before it for transmitting or reproducing a picture.
noun 1. a device in which the specimen is examined point by point directly in a moving electron beam, and electrons reflected by the specimen are used to form a magnified, three-dimensional image on a television screen. Abbreviation: SEM. scanning electron microscope noun 1. a type of electron microscope that produces a three-dimensional image scanning […]
- Scanning force microscope
scanning force microscope See atomic force microscope.
noun 1. (in a cathode-ray or television tube) a single horizontal trace made by the electron beam in one traversal of the fluorescent screen. Compare frame (def 9).
- Scanning probe microscope
scanning probe microscope definition Any of a number of devices capable of producing images of individual atoms and molecules on surfaces of materials. (See also nanotechnology.)