What light source does iodine tungsten lamp belong to?

Iodine tungsten lamp is a heat radiation source, which can convert heat energy into light energy.

Iodine tungsten lamp works like an incandescent lamp, but it is filled with iodine vapor. Iodine vapor combines with tungsten at low temperature and decomposes at high temperature. This sublimated tungsten compound will be decomposed again by iodine vapor, thus protecting the filament from being burned by high temperature.

Iodine tungsten lamp and bromine tungsten lamps are examples of successful application of the cycle principle of halogen tungsten lamps. The earliest tungsten halogen lamp was iodine tungsten lamp, which used iodine as a circulating agent. Iodine is relatively inactive and does not have a strong corrosive effect like other halogens. The bulb is filled with pure iodine, and the temperature is controlled between 250 ~ 1200℃. After evaporation, tungsten wire will combine with iodine to synthesize tungsten iodide. Tungsten iodide will diffuse near the filament, because the temperature here can be as high as 2000℃, unstable tungsten iodide will be decomposed into iodine and tungsten here, tungsten will return to the filament to continue working, and iodine will diffuse to the glass bulb again, completing the new task of "carrying" tungsten.

Structural characteristics of iodine tungsten lamp:

The average life of ordinary incandescent lamps is 1000 hours, while the average life of iodine tungsten lamp is half that of ordinary incandescent lamps, and the luminous efficiency is improved by 30%. Iodine tungsten lamp is small and exquisite, while iodine tungsten lamp is only 1% of incandescent lamp. The glass shell of the bulb is filled with iodine and inert gas, which is very strong, and the inflation pressure is as high as 1.5 ~ 10 atmospheric pressure.

The most common iodine tungsten lamp is slender and looks like a pen. The main body of the lamp is a quartz tube with a diameter of 10 ~ 12 mm, and its softening point is as high as 1700℃. The filament is supported by a support ring at regular intervals, and the rectangular flat blocks at both ends of the lamp are sealing parts, which can conduct electricity without leakage.

According to different purposes, iodine tungsten lamp can be divided into the following categories:

1. Some iodine tungsten lamp can emit a lot of invisible infrared rays with high thermal efficiency, which is an ideal heat source for heating and drying.

2. Some iodine tungsten lamp have high power and can radiate a lot of light energy, which is suitable for lighting in large workshops, squares, stadiums, airports, ports and other places.

3. Some iodine tungsten lamp are suitable for news photography, color photography and film photography and projection light sources. High power, small size and light weight.

4. In some laser devices, iodine tungsten lamp can be used as an optical pump.

When using iodine tungsten lamp, you need to pay attention to the following items:

1, iodine tungsten lamp foam is made of high-temperature resistant timely glass. If it is touched by hand or oil, the glass will lose its luster, become turbid, reduce its brightness, shorten its service life, and even cause the glass shell to break.

2. When lighting, the temperature at the seal should not exceed 350 degrees, otherwise the life of the bulb will be shortened, so the lamps must have good ventilation and heat dissipation.

3, lighting, avoid cold air blowing directly to the bulb.

4. Avoid vibration or vibration when lighting.

Never touch the light bulb when it is on or just turned off, because the temperature of the light bulb is still very high.