OVERVIEW: FLIR (Forward-Looking Infrared) is a passive thermal imaging system that detects infrared radiation (heat) to generate real-time imagery, enabling detection, recognition, and tracking of targets in complete darkness or obscured environments.

GENERAL DESCRIPTION: 3rd generation FLIR systems utilized two-dimensional focal plane arrays (FPAs), often with dual-band sensing capabilities (MWIR and LWIR), cryogenic cooling, and onboard digital processing. These features enabled real-time, high-resolution thermal imagery with greater range, contrast, and accuracy for target detection, identification, and engagement. They were widely integrated into targeting pods, EO/IR turrets, and surveillance systems across air, land, and sea domains before being surpassed by modern multi-spectral and high-definition 4th generation sensors.

ROLE SUMMARY:
Category: Infrared Imaging Systems
Primary Use: Target acquisition, navigation, fire control, and ISR (Intelligence, Surveillance, Reconnaissance)
Function: Real-time high-resolution thermal imaging using cooled focal plane arrays
Platform: Fighter aircraft, attack helicopters, UAVs, tanks, warships
Integration: Fully integrated with modern fire-control, mission computers, and sensor fusion suites

See Specific information under [Sensors/EW] and [Properties] sections.

SOURCE:
U.S. DoD Sensor Evolution Reports
https://en.wikipedia.org/wiki/Forward-looking_infrared