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中文摘要：
使用空心针板放电装置,以氩气作为导入气体,在大气环境下产生了1.6~3 cm波长的等离子体炬。利用发射光谱法,研究了等离子体炬弧根和弧梢处的气体温度和振动温度,以及它们随气体流量的变化。等离子体气体温度通过对OH基309 nm附近的谱带进行拟合得到,等离子体振动温度由氮分子第二正带系C3Πu—B3Πg计算得到。实验发现弧根和弧梢处的气体温度相等,并随着气体流量的增大而下降。当气体流量从3.0 mL.min-1增大到6.5 mL.min-1时,气体温度由350 K下降到300 K。当气体流量较小（如3.0 mL.min-1）时,弧梢处的振动温度（1 950 K）高于弧根处的振动温度（1 755 K）。随着气体流量的增大,弧梢处与弧根处的振动温度均下降,但弧梢处下降速率较快。当气体流量较大时,二者趋于相等。
英文摘要：
A 1.6-3 cm long plasma torch was generated when argon gas was introduced by using a hollowneedle-plate discharge device working in atmosphere.The vibrational temperature and the gas temperature at plasma root and tip were studied by using optical emission spectrum at different argon gas flow.The gas temperature was obtained by comparing experimental line shape of OH radicals band around 309 nm with its simulated line shape.The vibrational temperature was calculated using N2 second positive band system C 3Πu-B 3Πg.It was found that the gas temperatures at arc root and arc tip are equal and they decrease with the argon flow rate increasing.The gas temperature decreases from 350 to 300 K when argon flow rate increases from 3.0 to 6.5 mL·min-1.The vibrational temperature at arc tip（1 950 K） is higher than that at arc root（1 755 K） under a low gas flow rate（e.g.3.0 mL·min-1）.With gas flow rate increasing,the vibrational temperature at both tip and root decreases,but the decreasing rate at arc tip is faster than that at arc root.When gas flow is larger,the vibrational temperatures at tip and root tend to be equal.
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