1. Defense

In the field of defense, optronics first and foremost make it possible to considerably improve daytime observation capabilities compared with simple human vision, and to extend these capabilities to night vision, thanks to highly sensitive sensors. During the day, improvements are particularly noticeable in unfavorable weather conditions (mist, fog), thanks to detectors adapted to spectral ranges where the atmosphere is generally more transparent than in the visible range, i.e. mainly the infrared (cf. some properties of atmospheric transmission in the associated article [E 4 000] "Optro- nics: basic parameters" or...