What principle is an infrared thermal imager used to measure temperature?
An infrared thermal imager uses an infrared detector, an optical imaging objective, and an optical scanning system (currently, focal plane technology eliminates the optical scanning system) to receive the infrared radiation energy distribution pattern of the measured target, which is reflected on the photosensitive element of the infrared detector. Between the optical system and the infrared detector, there is an optical scanning mechanism (which is not present in the focal plane thermal imager) to scan the infrared thermal image of the measured object and focus it on the unit or spectral detector. The detector converts the infrared radiation energy into electrical signals, which are amplified, converted, or standard video signals are displayed on the television screen or monitor to display the infrared thermal image. This thermal image corresponds to the thermal distribution field on the surface of the object; In essence, it is the thermal image distribution map of the infrared radiation of various parts of the tested target object. Due to the weak signal, compared with visible light images, it lacks hierarchy and three-dimensional sense. Therefore, in the actual operation process, in order to more effectively judge the infrared thermal distribution field of the tested target, some auxiliary measures are often used to increase the practical functions of the instrument, such as controlling image brightness and contrast, real standard correction, pseudo color description and other technologies.
Infrared diagnostic technology is precisely by absorbing this infrared radiation energy, measuring the surface temperature and temperature field distribution of the equipment, in order to determine the heating situation of the equipment.
Infrared detection technology is a key promotion project of national scientific and technological achievements during the Ninth Five Year Plan period. Infrared detection is an online monitoring and uninterrupted high-tech detection technology that integrates photoelectric imaging technology, computer technology, and image processing technology. By receiving infrared infrared radiation emitted by objects, its thermal image is displayed on a fluorescent screen, accurately judging the temperature distribution on the surface of objects. It has the advantages of accuracy, real-time, and speed. Any object, due to the movement of its own molecules, continuously radiates infrared heat energy outward, forming a certain temperature field on the surface of the object, commonly known as a "thermal image". Infrared diagnostic technology is precisely by absorbing this infrared radiation energy, measuring the surface temperature and temperature field distribution of the equipment, in order to determine the heating situation of the equipment. At present, there are many testing equipment that use infrared diagnostic technology, such as infrared thermometers, infrared thermal televisions, infrared thermal imagers, and so on. Devices such as infrared thermal televisions and infrared thermal imagers use thermal imaging technology to transform invisible "thermal images" into visible light images, making the testing effect intuitive and highly sensitive. They can detect subtle changes in the thermal state of the equipment, accurately reflect the internal and external heating conditions of the equipment, have high reliability, and are very effective in discovering equipment hazards.
