The gas temperature of a hybrid discharge in atmospheric pressure air is investigated by using quantitative schlieren imaging. The discharge is stabilized in a pin-to-plate electrode geometry and operated in a millisecond pulsed-DC regime with current amplitudes up to 75 mA and a duration of 10 ms, applied at a frequency of 100 Hz. An equilibrium composition model is considered to account for the production of N, O, and NO, which influence the Gladstone–Dale coefficient of air at high-gas temperatures. Also, a procedure is described which allows the determination of the errors introduced in the time-average gas refraction index due to gas temperature fluctuations. The results show that the axial values of the gas temperature profiles span a large range from ~ 1000 to 5000 K, nearly following the evolution of the discharge current. The temperature values found agree well with those reported in the literature for atmospheric pressure air plasmas, ranging from micro-glow to hybrid discharges.

使用定量纹影成像研究了大气压空气中混合放电的气体温度。放电稳定在针对板电极几何结构中，并在毫秒脉冲直流状态下运行，电流幅度高达 75 mA，持续时间为 10 ms，以 100 Hz 的频率施加。平衡组成模型被认为可以解释 N、O 和 NO 的产生，这会影响高气体温度下空气的 Gladstone-Dale 系数。此外，描述了允许确定由于气体温度波动而在时间平均气体折射率中引入的误差的过程。结果表明，气体温度分布的轴向值跨越了从 ~ 1000 到 5000 K 的大范围，几乎跟随放电电流的演变。