A comparison of gas temperatures measured by ultraviolet laser scattering in atmospheric plasma sources
A comparison of gas temperatures measured by ultraviolet laser scattering in atmospheric plasma sources
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DOI：
10.1088/0022-3727/48/48/485202
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
B. Sommers;S. Adams
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文献类型：
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作者：
B. Sommers;S. Adams
为了测量大气等离子体源中的气体温度，利用紫外激光器和三光栅光谱仪组装了一套激光散射系统。这种激光散射相互作用为研究大气微等离子体源提供了一种非侵入性技术，在遥感光学传感、材料加工和环境净化等方面具有潜在的应用。这个特定系统的独特之处在于它利用紫外激光线（266 nm），与在可见光范围内工作的更常见的532 nm激光相比，它将Rayleigh和拉曼散射的横截面增加了16倍。在这项工作中，激光散射系统被用来直接比较旋转气体温度（Tr）和气体动力学温度（Tg）在两个不同的大气等离子体源[]：直流等离子体射流操作氮气和[]传统的针针辉光微放电在空气中。结果表明，在等离子体射流的低温余辉（300-700 K）和大气辉光的热中心（1500-2000 K）之间的Tr和Tg之间的协议。这些观测结果证实了大气等离子体中旋转弛豫的普遍假设，并验证了紫外激光诊断在大气微等离子体源中的未来应用。
A laser scattering system utilizing an ultraviolet laser with a triple grating spectrometer has been assembled in order to measure gas temperature in atmospheric plasma sources. Such laser scattering interactions offer a non-invasive technique for investigating atmospheric microplasma sources, which have potential applications in remote optical sensing, materials processing, and environmental decontamination. This particular system is unique in that it utilizes a ultraviolet laser line (266 nm), which increases the cross section for Rayleigh and Raman scattering by a factor of 16 in comparison to the more common 532 nm laser operating in the visible range. In this work, the laser scattering system is used to directly compare the rotational gas temperature (Tr) and gas kinetic temperature (Tg) in two different atmospheric plasma sources []: a direct current plasma jet operating on nitrogen and [] a conventional pin–pin glow microdischarge in air. Results show agreement between Tr and Tg both in the low temperature afterglow of the plasma jet (300–700 K) and the hot center of the atmospheric glow (1500–2000 K). These observations lend credence to the common assumption of rotational relaxation in atmospheric plasmas and validate the ultraviolet laser diagnostic for future application in atmospheric microplasma sources.