166 / 2024-04-15 14:37:23

Investigation of the absorption effect inside the vacuum arcs by a collisional radiative model

optical emission spectroscopy, absorption effect, collisional radiative model, vacuum arcs

Optical emission spectroscopy (OES) is an effective method for measuring crucial physical parameters such as electron temperature, electron density, and atomic density in vacuum arcs. Nevertheless, the presence of the absorption effect poses challenges in identifying accurate spectral information, which can lead to measurement errors in these physical parameters. To address these issues, we have developed a collisional radiative model (CRM) to investigate the effect of absorption on the measurement based on the OES. The CRM described the dynamical process of copper atoms in vacuum arcs, including electron impact excitation and de-excitation, ionization and three-body recombination, spontaneous radiative and absorption. Combined with the electron temperature and excited states density of upper levels corresponding to the spectral lines (510.6 nm and 515.3 nm), which were provided by the OES, the population density of copper atoms and the escape factor characterizing the absorption effect were iteratively calculated.