2023/08/31 by A. Murmantsev, A. Veklich, Margarita Baeva +2 · 1 voice
Engineering · #Laser-induced spectroscopy and plasma #Plasma Diagnostics and Applications #Welding Techniques and Residual Stresses
paper · pdf · doi:10.14311/ppt.2023.2.103
openalex publication_date 2023/08/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The radiation from the arc plasma ignited between the flat ends of copper electrodes in atmospheric pressure air at a direct current of 3.5 A is analyzed to determine the plasma temperature and composition. Side-on spectra in the range (430 – 650) nm are recorded using a CMOS camera connected to a spectrograph. The spectral emission coefficient is evaluated from the spectral radiance, which provides the radiator number density. The excitation temperature is obtained by applying the Boltzmann plot technique to at least two spectral lines and a series of radial positions in the midplane of the arc. Subsequently, the plasma composition is determined. The equation of radiative transfer is solved along lines of sight considered in the experiment. The spectral intensity of Cu I lines is computed and compared with the experimental ones. The arc properties are obtained by assuming axial symmetry and mapping the evaluated values in the midplane.