The atmosphere, smoke clouds, etc. absorb visible light and near-infrared rays, but are transparent to infrared rays of 3~5um and 8~14um. Therefore, these two bands are called the "atmospheric color window" of the infrared. Using these two windows, you can clearly observe the situation in front of you at night when there is no light, or in a harsh environment filled with smoke and clouds. It is precisely because of this feature that infrared imaging technology will play a big role in the field of security.

 

Generally, camouflage is mainly to prevent visible light observation. For example, solo criminals usually hide in bushes and woods when committing crimes. Because of the harsh outdoor environment and human visual illusions, it is easy to make wrong judgments and fail to recognize them. The thermal imaging camera passively receives the thermal radiation of the target itself. When the human body and vehicles are hidden in the grass and woods, their temperature and infrared radiation are generally much higher than the temperature and infrared radiation of the vegetation, so it is easy to be automatically identified. .

 

In addition, ordinary surveillance cameras cannot see objects hidden under the surface of luminous objects, such as buried stolen items, which cannot be effectively detected and identified. Infrared imagers developed using infrared imaging technology can detect and identify, because when a surface is disturbed, the thermal profile of the surface is also destroyed, such as overturned soil thermal radiation and compacted soil Thermal radiation is different. Therefore, through this function of the infrared imager, buried objects and the like can be found.