Laser energy absorption determination - by comparison with temperature rise by black body absorption

摘要

The efficiency of laser pulses used for welding is measured by measuring the temp. rise in the workpiece when the latter is arranged as a black body, i.e. when all the laser energy impinging on it is absorbed and converted to heat. The energy is determined by the energy stored in a capacitor which brings about the same temp. rise. The ratio between the temp. rise produced by a laser beam in a prodn. arrangement to that of a black body indicates the proportion of laser energy absorbed. If the amount of energy absorbed by the workpiece is known, optimum treatment conditions can be specified. The result is a better quality of weld.