Fig. 1. Schematic diagram of the test device

Fig. 2. The emission spectrum of atmospheric pressure argon/air plasma jet

Fig. 3. The Boltzmann fitting line of electronic excitation temperature

Fig. 4. The electron excitation temperature under different peak voltages

Fig. 5. The Boltzmann fitting line of Plasma vibration temperature

Fig. 6. The plasma vibration temperature under different peak voltages