Only military infrared thermal imagers can produce good images. It does not need to use starlight, moonlight, but uses the difference of thermal radiation of objects to image. The temperature is high when the screen is bright, and low when the screen is dark. Good MILITARY INFRARED THERMAL IMAGERS CAN REFLECT TEMPERATURE DIFFERENCES OF ONE THOUSANDTH OF a DEGREE, SO THEY CAN DETECT VEHICLES, PEOPLE, AND EVEN BURIED OBJECTS HIDDEN IN TREES and GRASS THROUGH smoke, RAIN, snow, AND CAMOUFLAGE.
Infrared thermal imaging night vision instrument is a branch of thermal imager, the traditional thermal imager is more hand-held, rather than telescope type, mainly used in traditional engineering detection. At the end of last century, with the development of thermal imaging technology, the United States military gradually began to equip with infrared thermal imaging night vision equipment due to the technical advantages of thermal imaging technology over traditional night vision equipment. Infrared thermal night vision, also known as a thermal imaging telescope, can still be used well during the day, but it is called infrared thermal night vision because it is mainly used at night.