In facsimile, the frequency at which a fixed line perpendicular to the direction of scanning is crossed by a scanning spot.
Note: The scanning line frequency is equivalent to drum speed in some mechanical systems. Synonym scanning line rate.

In facsimile systems, the total length of a scanning line, equal to the spot speed divided by the scanning line frequency.
Note: The scanning line length is usually greater than the length of the available line.

In facsimile systems, the time interval between (a) the instant at which the scanning spot probes or writes to a given spot on one scanning line, and (b) the instant at which the scanning spot probes or writes to the corresponding spot on the next scanning line.

Synonym scanning line frequency.

The distance between the centers of consecutive scanning lines.

In facsimile and television systems, the rate of displacement of the scanning spot along the scanning line.

In facsimile systems, the area on the object, i.e., the original, covered instantaneously by the pickup system of the scanner.

See scattering.

Of a wave propagating in a material medium, a phenomenon in which the direction, frequency, or polarization of the wave is changed when the wave encounters discontinuities in the medium, or interacts with the material at the atomic or molecular level.
Note: Scattering results in a disordered or random change in the incident energy distribution.

In the microstructure of a transmission medium, a site at which electromagnetic waves are scattered.
Note 1: Examples of scattering centers are vacancy defects; interstitial defects; inclusions, such as a gas molecules, hydroxide ions, iron ions, and trapped water molecules; and microcracks or fractures in dielectric waveguides.
Note 2: Scattering centers are frozen in the medium when it solidifies and… (Read More →)