Spectroscopic diagnostics, using intensified high speed CCD camera, was applied to study the arc dynamics in low voltage circuit breakers, in vacuum and in air. Time-resolved emission spectroscopy of the vacuum arc plasma, generated during electrode separation, provided information about the interruption process. The investigations were focused on the partial unsuccessful interruption around current zero. Absorption spectroscopy, in a peculiar setup, was used in order to determine the metallic atoms densities in the interelectrode space of a low voltage circuit breaker, working in ambient air.
The thin titanium nitride films deposited on glass in a planar d.c. magnetron configuration have been optically investigated. The influence of the nitrogen partial pressure, substrate bias and film thickness as deposition parameters on the transmission (Vis) and the reflectance (Vis, FIR) spectra of the samples was studied. The analysis of surface properties of TiN films was also made by spectroscopic ellipsometry for different deposition conditions. The data were compared with the similar spectrum of a gold evaporated film.