The heating principle of the halogen infrared double tube mainly includes the following aspects:
Excitation and energy release of halogen atoms: The halogen infrared double tube is filled with halogen element gas, usually iodine or bromine. When the current passes through the filament, the filament heats up to generate high temperature, causing the tungsten atoms to evaporate and move toward the glass tube wall. When the tungsten vapor approaches the glass tube wall, it will be cooled to about 800℃ and combined with the halogen atoms to form tungsten halides, such as tungsten iodide or tungsten bromide. The tungsten halide continues to move toward the center of the glass tube and returns to the oxidized filament. Since tungsten halide is a very unstable compound, it will decompose into halogen vapor and tungsten again when it encounters heat. In this way, tungsten is deposited on the filament again to make up for the evaporated part. Through this regeneration cycle process, the service life of the filament is not only greatly extended, but also because the filament can work at a higher temperature, it can emit more light and heat.
Generation of infrared rays: In the above process, the filament heats up to a high temperature state. According to the black body radiation law, any object with a temperature higher than absolute zero will radiate electromagnetic waves outward, and the higher the temperature, the greater the total energy radiated, and the more short-wave components. When the filament temperature is high enough, a large amount of infrared rays will be radiated. In addition, since halogen atoms release energy in a specific band when they are excited and restored to an unexcited state, many of which exist in the form of infrared rays. These infrared rays and the infrared rays radiated by the filament itself together constitute the heating energy source of the halogen infrared double tube.
Heat transfer: The infrared rays generated by the halogen infrared double tube radiate to the surrounding space in the form of electromagnetic waves. When the infrared rays are irradiated to the surface of an object, three phenomena will occur: reflection, absorption and transmission. Among them, the infrared energy absorbed by the object will cause the vibration and rotation of the molecules inside the object to intensify, thereby increasing the internal energy of the object and raising the temperature, achieving a heating effect. Since infrared rays have strong penetrating power, they can penetrate deep into the interior of an object to heat it, making the heating of the object more uniform.
The role of the reflector: Some halogen infrared double-tube devices are equipped with a reflector, which reflects and focuses the infrared rays emitted by the halogen filament, concentrating the infrared rays in a small area, increasing the energy density of the area, thereby enhancing the heating effect, allowing the heated object to heat up more quickly, and also helping to improve energy utilization efficiency and reduce energy loss.

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