采用电压电流波形和Lissajous图测量及发光图像拍摄等诊断手段研究了大气压大面积空气中水电极结构介质阻挡放电的演变规律，并由发射光谱测量了氮分子第二正带系谱线强度随外加电压和电源频率的变化规律，利用测得的发射光谱数据计算分子振动温度等参数。结果表明：随着外加电压的升高，放电由局部点状逐渐演变为大面积絮状混合形式；其分子振动温度的变化范围为2547~3783 K，且电离系数的升高和单位时间内放电次数的增加能有效促使放电功率和振动温度的增加。
The evolution law of large-area dielectric barrier discharge of water electrode in air at atmo-spheric pressure was studied by measuring voltage and current waveforms and Lissajous figures and tak-ing illuminate images. The change of spectral line intensity of second positive band system of N2 with the applied voltage and frequency was measured by emission spectrum, and the molecular vibrational tem-perature was calculated from the measured emission spectral data. The results show that with the increase of applied voltage, the discharge form gradually evolves from local point form to large area flocculent mixed form, and the molecular vibrational temperature is in the range of 2 547 K to 3 783 K. Moreover, the increase of ionization coefficient and discharge times per unit time can promote the increase of dis-charge power and vibrational temperature.
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