Controlling gas temperature via continuous monitoring is essential in various plasma applications especially for biomedical treatments and nanomaterial synthesis but traditional techniques have limitations due to low accuracy, high cost or experimental complexity. We demonstrate continuous high-accuracy gas temperature measurements of low-temperature atmospheric pressure plasma jets using a small focal spot infrared sensor directed at the outer quartz wall of the plasma. The impact of heat transfer across the capillary tube was determined using calibration measurements of the inner wall temperature. Measured gas temperatures varied from 25 °C–50 °C, increasing with absorbed power and decreased gas flow. The introduction into the plasma of a stream (∼10 5 s −1 ) of microdroplets, in the size range 12 μ m–15 μ m, led to a reduction in gas temperature of up to 10 °C, for the same absorbed power. This is an important parameter in determining droplet ev...

中文翻译：

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使用聚焦点红外传感器连续测量包含微滴的冷等离子体射流的气体温度

在各种等离子体应用中，尤其是对于生物医学治疗和纳米材料合成而言，通过连续监测来控制气体温度是必不可少的，但是传统技术由于准确性低，成本高或实验复杂而受到限制。我们演示了使用对准等离子体外部石英壁的小型焦点红外传感器对低温大气压等离子体射流进行的连续高精度气体温度测量。使用内壁温度的校准测量来确定传热通过毛细管的影响。测得的气体温度在25°C–50°C之间变化，随着吸收功率的增加和气体流量的减少而增加。将大小范围为12μm–15μm的微滴流（约10 5 s -1）引入血浆，在相同的吸收功率下，气体温度降低了10°C。这是确定液滴蒸发量的重要参数。