Abstract
Laser absorption spectroscopy was applied to pure oxygen flows generated by an inductively heated plasma generator IPG3. Temporal variation of translational temperature was deduced from measured absorption line broadening of OI 777.19nm because the flow properties fluctuated at 300Hz in synchronization with the induction current. The specific total enthalpy and mole fraction of oxygen were estimated from the deduced temperature assuming thermo-chemical equilibrium. Consequently, the averaged degree of dissociation of oxygen is 92%. The specific total enthalpy on the centerline was estimated at 33.7±2.9MJ/kg; 43% of it was in the form of chemical potential. Results show good agreement with intrusive measurements.
