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电热或电热化学发射中以等离子体实现能量的转化，等离子体的阻抗特性决定了能量的转化效率．从实验角度研究了毛细管内电弧放电生成的等离子体的负载阻抗特性．通过测量放电过程中等离子体负载的电压、电流，分析了等离子体负载阻抗值在不同放电电压及环境背压条件下的变化趋势及其对电能输入效率的影响．实验结果表明毛细管内等离子体负载阻抗与放电电压成反比、电能输入效率与毛细管外背压成反比．
Electrothermal or electrothermal chemical emission plasma to achieve energy conversion, the plasma impedance characteristics of the energy conversion efficiency. The load impedance characteristics of plasma generated by arc discharge in capillary tube were studied experimentally. By measuring the voltage and current of plasma load during discharge, the changing trend of plasma load impedance under different discharge voltage and ambient back pressure and its influence on the efficiency of power input were analyzed. The experimental results show that the plasma load impedance in capillary is inversely proportional to the discharge voltage, and the input efficiency of electric energy is inversely proportional to the external capillary pressure.