ISO 18251-1:2017 describes the main components, and their characteristics, constituting an infrared (IR) imaging system and related equipment used in non-destructive testing (NDT). It also aims to assist the user in the selection of an appropriate system for a particular measurement task.

The following items are specified:

- objective lens;

- detector;

- image processor;

- display;

- thermal stimulation source;

- accessories.