Heat Radiation
Thermal radiation is an electromagnetic radiation in the spectral range of 1-15 µm, given off by all bodies which have a temperature of higher than 0 Kelvin. Thermal radiation is used in the soldering processes to heat the assemblies to be soldered. Dependent on the wavelength emitted, the IR emitters react either slow or with almost no inertia. The shorter the wave length, the greater the danger of burns on the board surface, since the temperature and the power density of these emitters is rather high.