What principle is an infrared thermometer used to measure temperature?
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 optoelectronic imaging technology, computer technology, and image processing technology. By receiving infrared infrared radiation emitted by objects, the thermal image is displayed on a fluorescent screen, accurately determining 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 thermal energy outward, forming a certain temperature field on the surface of the object, commonly known as a "thermal image". Infrared diagnostic technology measures the surface temperature and temperature field distribution of equipment by absorbing this infrared radiation energy, thereby determining the heating status 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 convert 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, and have high reliability, which is very effective in detecting equipment hazards.
Infrared thermal imagers use infrared detectors, optical imaging objectives, and optical mechanical scanning systems (currently advanced focal plane technology eliminates optical mechanical scanning systems) to receive the infrared radiation energy distribution pattern of the tested object and reflect it on the photosensitive elements of the infrared detector. Between the optical system and the infrared detector, there is an optical mechanical scanning mechanism (which is not available in focal plane thermal imagers) to scan the infrared thermal image of the tested object, And focus on the unit or spectroscopic detector, which converts infrared radiation energy into electrical signals. After amplification, conversion, or standard video signals are displayed on the television screen or monitor, the infrared thermal image is displayed. This thermal image corresponds to the thermal distribution field on the surface of the object; Essentially, it is the thermal image distribution map of the infrared radiation of various parts of the measured target object. Due to the weak signal, compared with visible light images, it lacks hierarchy and stereoscopic sense. Therefore, in the actual operation process, in order to more effectively judge the infrared thermal distribution field of the measured target, some auxiliary measures are often used to increase the practical functions of the instrument, such as controlling image brightness and contrast, real calibration, pseudo color description, and other technologies.
