Continuous gas temperature measurement of cold plasma jets containing microdroplets, using a focussed spot IR sensor
Continuous gas temperature measurement of cold plasma jets containing microdroplets, using a focussed spot IR sensor
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DOI：
10.1088/1361-6595/aba2aa
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发表时间：
2020-08-01
影响因子：
3.8
通讯作者：
Maguire, P.
中科院分区：
文献类型：
--
作者：
Hendawy, N.;McQuaid, H.;Maguire, P.
通过连续监测来控制气体温度在各种等离子体应用中是必不可少的，特别是在生物医学治疗和纳米材料合成中，但传统技术由于精度低、成本高或实验复杂而受到限制。我们演示了低温大气压等离子射流的连续高精度气体温度测量，使用小型焦斑红外传感器指向等离子体的外石英壁。通过对毛细管内壁温度的校准测量来确定传热对毛细管的影响。测量的气体温度从25℃到50℃不等，随着吸收功率的增加和气体流量的减少而增加。在等离子体中引入一个流(类似于10（5)s(-1)）的微液滴，尺寸范围在12 μ m-15 μ m之间，导致气体温度降低高达10℃，但吸收功率相同。这是测定液滴蒸发及其对等离子体化学影响的一个重要参数。
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 degrees C-50 degrees C, increasing with absorbed power and decreased gas flow. The introduction into the plasma of a stream (similar to 10(5)s(-1)) of microdroplets, in the size range 12 mu m-15 mu m, led to a reduction in gas temperature of up to 10 degrees C, for the same absorbed power. This is an important parameter in determining droplet evaporation and its impact on plasma chemistry.