Silicon carbide is a simple infrared light source
The power required for the use of the silicon carbide rod is about 4 kilowatts, the electrode part is cooled with water, and the cavity cover uses a potassium bromide light window, which makes it easier to output heat radiation. Once the vaporized carbon adheres to the chamber cover, it will cause a loss of current and cause the light source to dim. Therefore, the cavity must be cleaned regularly.
Silicon carbide is a simple infrared light source. As a light source for photoacoustic spectroscopy, its radiation beam intensity is lower by more than one order of magnitude. For this reason, incandescent carbon rods with higher input power and working at high temperatures are used as the light source of the photoacoustic spectrum. The carbon rod is energized in an argon atmosphere. The heat radiation distribution temperature of about 2500K can be obtained. The life of the silicon carbide rod is about 400 hours. It can be made of spectrally pure high-purity carbon. In the center of a carbon rod with a diameter of 8 mm and a length of 120 mm, there is a length of 6 cm. A V-shaped groove with a depth of 3 mm is used as a heat radiation area.