This document 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.st edition 2017-02 Non-destructive testing — Infrared thermography — Part 1: Characteristics of system and equipment Essais non destructifs — Thermographie infrarouge — Partie 1: Caractéristiques du système et des équipements Reference number ISO 18251-1:2017(E) ？ ISO 2017 ISO 18251-1:2017(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2017, Published in Swit