Brief introduction of tungsten halogen lamp;
Halogen lamp is a kind of gas-filled incandescent lamp, and its filling gas contains some halogen elements or halides. In ordinary incandescent lamps, the high temperature of filament makes tungsten evaporate, and the evaporated tungsten precipitates on the glass bulb, which leads to the phenomenon that the glass bulb turns black.
Classification:
Tungsten halogen lamps can be divided into six categories according to their uses: lighting tungsten halogen lamps, high-voltage double-ended lamps, low-voltage single-ended lamps and multi-plane cold reflection low-voltage directional lighting lamps, which are widely used for indoor lighting in shops, windows, exhibition halls and families. Automobile tungsten halogen lamps are divided into headlights, low beam lamps, turn signals and brake lamps. Infrared rays and ultraviolet rays irradiate tungsten halogen lamps, and infrared rays irradiate tungsten halogen lamps for heating equipment and photocopiers.
Photographic tungsten halogen lamp has replaced ordinary tungsten filament incandescent lamp in stage film and television and news photography lighting. Instruments Tungsten halogen lamps are used in modern microscopes, projectors, slides and medical instruments. Cold reflector halogen tungsten lamp is used in portable film machine, slide projector, medical and industrial endoscope, dental surgery coloring and curing, color photo printing and other optical instruments.
Principle of tungsten halogen lamp:
1, loop
The process of tungsten halide circulation is as follows: under appropriate temperature conditions, the tungsten evaporated from the filament reacts with halogen substances in the bubble wall area to generate volatile tungsten halide compounds. Because the bubble wall temperature is high enough (250℃), the tungsten halide compound is in a gaseous state, and when it diffuses to the area around the hot filament, it is differentiated into halogen and tungsten.
A part of the released tungsten returns to the filament, while the halogen continues to participate in the cycle. Halogens such as fluorine, chlorine, bromine and iodine can produce tungsten regeneration cycle. The main difference between them lies in the temperature required for cyclic reaction and the degree of interaction with other substances in the lamp. A large number of bromine tungsten lamps and iodine tungsten lamp lamps are produced, and some lamps also use chlorine as a recycling agent.
Step 2: shine
The luminous principle of all incandescent lamps is realized by using the principle that objects emit light when heated and the principle of thermal radiation. The simplest incandescent lamp is to connect enough current to the filament, which will glow when heated to incandescent state, but the life of this incandescent lamp will be quite short.