In nature, all objects emit infrared rays. Therefore, by using a detector to measure the difference in infrared rays between the target itself and the background, different infrared images can be obtained, which are called thermal images. The thermal image of the same target is different from the visible light image. It is not the visible light image that the human eye can see, but the image of the surface temperature distribution of the target. Or it can be said that it is the surface temperature distribution of the target that the human eye cannot directly see, but has transformed into a thermal image representing the surface temperature distribution of the target that the human eye can see. By applying this method, it is possible to achieve long-distance thermal state image imaging and temperature measurement of the target, and intelligent analysis and judgment can be carried out.
Infrared thermal imaging technology is a passive infrared night vision technology. Its principle is based on the fact that all objects in nature with a temperature higher than absolute zero (-273℃) emit infrared rays at all times, and this infrared radiation carries the characteristic information of the object. This provides an objective basis for using infrared technology to determine the temperature and thermal distribution field of various measured targets. By taking advantage of this feature, the power signal radiated by the heat-generating part of the object is converted into an electrical signal through a photoelectric infrared detector. Then, the imaging device can correspondingly simulate the spatial distribution of the object’s surface temperature. Finally, after processing by the system, a thermal image video signal is formed and transmitted to the display screen, resulting in a thermal image corresponding to the thermal distribution of the object’s surface, that is, an infrared thermal image.
Compared with general detection equipment, infrared thermal imagers have the following distinct features:
Thermal imagers can measure the temperature of moving objects, which is difficult for ordinary temperature measuring instruments to achieve.
2. The temperature of targets several micrometers or even smaller can be measured with the help of a microscopic lens
3. It can quickly conduct thermal diagnosis on the equipment
4. It will not interfere with the measured temperature field.
5. It has a wide temperature measurement range. Depending on the model, it can generally measure within the range of 0 to 2000℃
6. High sensitivity. Depending on the model, it can distinguish temperature differences of 0.1℃ or even smaller.
7. Safe to use: Due to the non-contact nature of the measurement, thermal imagers are very safe to use.
