infrared detector mounted on a motor-driven platform which causes it to scan a field of view line-by-line, much as in television.

wide class of instruments used to display and/or record information which is proportional to or equivalent to the thermal radiation from any object surfaces viewed by the instrument. The instrumentation varies from simple spot radiometers, which measure only one spot or area, to two-dimensional thermal imagers, which provide photographic quality pictures and which map the scene radiosity 

generation of thermograms of building structures as viewed from overhead using an imaging line scanner 

property of a system to reach a steady state after a disturbance without the intervention of a control equipment