Development of environmental-friendly arc quenching medium alternative to SF_6 using pulse modulated induction plasma

1)气体夹杂对脉冲调制感应热等离子体稳定工作区的影响脉冲调制感应热等离子体(PMITP)稳定工作区高度依赖于外加气体，而外加气体与气体的等离子体猝灭能力有关。为了考察不同气体对等离子体的猝灭能力，在Ar-PMITP中注入了N_2、H_2、Q_2和CO_2四种环境友好气体。结果表明，CO_2的加入显著降低了PMITP的稳定工作区。2)气体夹杂物对脉冲调制感应热等离子体暂态行为的影响气体夹杂物影响PMITP的暂态行为，这也与气体的等离子体猝灭能力密切相关。测量了外加气体对PMITP产生的Ar谱线辐射强度的时间演化影响。结果表明，CO_2夹杂使PMITP的暂态行为延迟。这也表明CO_2具有较高的等离子体猝灭能力。3)气体包裹体对Ar激发温度随时间变化的影响时间分辨辐射强度测量使我们能够估计PMITP的Ar激发温度。该温度的估算采用了Ar谱线的双线法。4)激光诱导等离子体的温度测量为了研究高温气体的介电强度，采用了激光诱导等离子体技术。在局部热平衡的假设下，用Boltzmann作图法计算了温度。根据计算结果，可以估算激光诱导等离子体温度。

1) Effect of gas inclusion on stable operation region of pulse-modulated induction thermal plasmaStable operation region of pulse-modulated induction thermal plasma(PMITP) highly depends on added gas, which is related to plasma-quenching ability of gases. In order to investigate plasma-quenching ability of various gases, Four kinds of environmentally-benign gases such as N_2, H_2, Q_2 and CO_2 was injected into Ar PMITP. The results indicates that inclusion of CO_2 decays drastically the stable operation region of PMITP. This means that CO_2 has a higher plasma-quenching ability compared with the other gases treated in the experiment.2) Effect of gas inclusion on transient behavior of pulse-modulated induction thermal plasmaGas inclusion affect transient behavior of PMITP, which is also markedly related with plasma-quenching ability of gases. We measured time evolution of radiation intensity of Ar line emitted from PMITP with added gases. As a result, CO_2 inclusion made transient behavior of PMITP delayed. This also indicates that CO_2 has high plasma-quenching ability.3) Effect of gas inclusion on time variation in Ar excitation temperatureThe time-resolved radiation intensity measurement permitted us to estimate Ar excitation temperature of PMITP. Two-line method of Ar spectral line was used for this temperature estimation. The results revealed that CO_2 inclusions decayed Ar excitation temperature markedly compared with the other gases.4) Temperature measurement of laser-induced plasmaIn order to study the dielectric strength of high-temperature gas, laser-induced plasma technique was adopted. Temperature was evaluated from Boltzmann plot method on the assumption of local thermal equilibrium. From the result, laser-induced plasma temperature can be estimated.