What tenet governs the measurement of temperature using an infrared thermometer?
Infrared detection technology is a key promotion project of national scientific and technological achievements during the "Ninth Five-Year Plan". Infrared infrared radiation, the thermal image is displayed on the fluorescent screen, so as to accurately judge the temperature distribution of the surface of the object, which has the advantages of accuracy, real-time, and rapidity. Due to the movement of its own molecules, any object continuously radiates infrared heat energy outward, thus forming a certain temperature field on the surface of the object, commonly known as "thermal image". Infrared diagnostic technology absorbs this infrared radiation energy to measure the temperature of the equipment surface and the distribution of the temperature field, so as to judge the heating condition of the equipment. At present, there are many test equipments using infrared diagnosis technology, such as infrared thermometer, infrared thermal TV, infrared thermal imager and so on. Equipment such as infrared thermal TVs and infrared thermal imaging cameras use thermal imaging technology to convert this invisible "thermal image" into a visible light image, making the test effect intuitive, high sensitivity, and able to detect subtle changes in the thermal state of the equipment and accurately reflect The internal and external heating conditions of the equipment have high reliability and are very effective in discovering hidden dangers of equipment.
Infrared thermal imager uses infrared detector, optical imaging objective lens and optical-mechanical scanning system (the current advanced focal plane technology omits optical-mechanical scanning system) to receive the infrared radiation energy distribution pattern of the measured target and reflect it to the photosensitive sensor of the infrared detector. In terms of elements, between the optical system and the infrared detector, there is an optical-mechanical scanning mechanism (the focal plane thermal imager does not have this mechanism) to scan the infrared thermal image of the measured object and focus on the unit or the spectroscopic detector. The infrared radiation energy is converted into an electrical signal by the detector, and the infrared thermal image is displayed on a TV screen or a monitor after amplification processing, conversion or standard video signal. This kind of thermal image corresponds to the thermal distribution field on the surface of the object; it is essentially the thermal image distribution of the infrared radiation of each part of the measured target object. Because the signal is very weak, compared with the visible light image, it lacks layers and three-dimensionality. Therefore, In order to judge the infrared heat distribution field of the measured target more effectively during the actual operation, some auxiliary measures are often used to increase the practical functions of the instrument, such as image brightness, contrast control, real standard correction, false color rendering and other technologies.
