Fig. 1. Schematic of experimental device for measuring oxygen content by laser-induced breakdown spectroscopy

Fig. 2. Laser induced-breakdown spectra of (a) oxygen/argon and (b) oxygen/nitrogen

Fig. 3. Laser induced-breakdown spectra of (a) oxygen/argon and (b) oxygen/nitrogen at different oxygen contents

Fig. 4. Calibration curves from oxygen spectral line intensity of (a) oxygen/argon plasma and (c) oxygen/nitrogen plasma; calibration curves from the ratio of oxygen spectral line intensity of (b) oxygen/argon plasma and (d) oxygen/nitrogen plasma to background intensity