In nature, all objects with temperatures above absolute zero are constantly emitting infrared radiation energy to the surrounding space. The magnitude of the infrared radiation energy of an object and its distribution by wavelength are closely related to its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, it can accurately measure its surface temperature, which is the objective basis on which infrared radiation is measured.
The principle of temperature measurement of infrared thermometer is to convert the radiant energy of infrared rays emitted by an object (such as molten steel) into an electrical signal. The magnitude of infrared radiant energy corresponds to the temperature of the object (such as molten steel) itself, according to the size of the electrical signal. , you can determine the temperature of an object (such as molten steel). The infrared thermometer consists of an optical system, a photodetector, a signal amplifier, signal processing, and display output. The optical system converges the target infrared radiation energy within its field of view. The size of the field of view is determined by the optical components of the thermometer and their position. The infrared energy is focused on the photodetector and converted into a corresponding electrical signal. The signal passes through the amplifier and the signal processing circuit, and is converted to the temperature value of the measured object after being corrected according to the algorithm of the internal treatment of the instrument and the target emissivity.
When using the infrared radiation thermometer to measure the temperature of the target, first measure the amount of infrared radiation in the range of the target, and then calculate the temperature of the target by the thermometer. According to the principle, the infrared thermometer can be divided into a monochrome thermometer and a two-color thermometer (radiation colorimeter). The monochrome thermometer is proportional to the amount of radiation in the band; the two-color thermometer and two bands The ratio of the amount of radiation is proportional.
3. Development and classification of infrared thermometers: Infrared temperature measurement technology has been developed to scan and measure the surface with thermal changes, determine the temperature distribution image, and quickly detect the hidden temperature difference. This is the infrared camera. The infrared thermal imager was first applied to the military. TI Company of the United States developed the world's first infrared scanning reconnaissance system. Later, infrared thermal imaging technology was used in aircraft, tanks, warships and other weapons in western countries as a reconnaissance target. The thermal sighting system greatly improves the ability to search and hit targets. Infrared thermometers are roughly classified as follows: (1) Infrared thermometers: both portable and fixed; (2) infrared scanners; (3) infrared cameras.
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