Publisher: Administrator Date：2022-02-10
Thermal imaging technology refers to the use of infrared detector and optical imaging objective lens to reflect the infrared radiation energy distribution of the measured target into the photosensitive element of the infrared detector, so as to obtain the infrared thermal image. This thermal image corresponds to the thermal distribution field of the surface. Generally speaking, infrared thermal imager converts the invisible infrared energy into visible thermal image. The different colors on the thermal image represent the different temperatures being tested.
Thermal imaging technology is based on the fact that all objects are heated. Many surfaces can't see anything, but there are still hot and cold on them. The temperature distribution can be seen through the colors in the heat map. Red and pink represent relatively high degrees Celsius, while blue and green represent lower degrees Celsius.
It was found that when the thermometer moved beyond the boundary of the red light, when he saw a dark area where he could not see any light, the degree Celsius was higher than the red light. Repeated experiments have proved that there is a "hotline" beyond the red light that people can't see, which was later called "infrared". It's "infrared radiation".
Infrared generally exists in nature. Any object above zero (- 273.16) will emit infrared. Like ice.
1. Universality. Objects around us can emit visible light only when their temperature is above 1000. On the contrary, all objects around us with degrees Celsius above zero (- 273) will continue to release thermal infrared rays. For example, the thermal infrared energy released by normal people can be calculated as about 100 watts. Therefore, thermal infrared (or thermal radiation) is a widely existing radiation in nature.
2. Penetration. Atmospheric smoke and clouds absorb visible light and near-infrared, but are transparent to thermal infrared of 3 ~ 5 microns and 8 ~ 14 microns. Therefore, these two bands are called the "atmospheric window" of thermal infrared. Using these two windows, you can clearly observe the situation ahead in a completely matte night or a smoky battlefield. It is precisely because of this feature that thermal infrared imaging technology provides military advanced night vision equipment, and is equipped with an all-day display system on aircraft, ships and tanks. These systems played a very important role in the Gulf War.
3. Thermal radioactivity. The thermal radiation energy of an object is directly related to the surface temperature. Through these characteristics of thermal radiation, people can carry out contactless Celsius measurement and thermal state analysis of objects, and provide important detection means and diagnostic tools for industrial production, energy conservation, environmental protection and so on.