Temperature diagnosis of underwater microsecond high-current pulsed discharge plasma

Abstract

Underwater pulsed arc discharge plasma serves as the “tool” for generating shock waves and high-energy species. To deeply study the characteristics of plasma channels, this paper conducted temperature diagnosis of underwater microsecond high-current pulsed discharge. A spectral measurement system calibration method considering the water absorption effect was proposed. Time-resolved emission spectra of the plasma channel were obtained, and the spectral characteristics during the arc discharge phase were analyzed. A diagnostic approach based on the combined analysis of spectral-line profiles and intensities was developed to determine the excitation temperature and blackbody radiation temperature. The time-dependent evolution of the blackbody radiation temperature and the excitation temperature of the plasma was characterized. The results indicate that, for kA-level pulsed high-current underwater arc plasmas, the temperature ranges of the order of 1–2 × 104 K.