When the detection range of the IR thermal imager is calculated by using NETD, the target radiation brightness difference must be calculated in the operating wave band.
The weapon operator search and locate the target using a periscope optical sight (7km range) in day light, or a thermal imager at night or in bad weather conditions.
Together, the thermal imager, daylight camera, and lasers are in a 4-axis gimbal stabilized pod that provides 360-degree coverage.
Design of uncooled LWIR thermal imager Switch-Zoom Optical System
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