Tomographic optical emission spectroscopy of a high enthalpy air plasma flow.
Tomographic optical emission spectroscopy of a high enthalpy air plasma flow.
复制标题
高焓空气等离子体流的断层光学发射光谱。
DOI：
10.1364/ao.55.010290
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发表时间：
2016
期刊：
影响因子：
1.9
通讯作者：
Andreas Andrianatos
中科院分区：
文献类型：
--
作者：
T. Hermann;S. Löhle;S. Fasoulas;Andreas Andrianatos
提出了一种方法，允许使用层析成像设置局部分辨发射光谱。本文提出的方法适用于高焓空气等离子体流。结果数据集允许使用测试部分的照片和流场光谱分辨率的2D表示来表示非对称流场的三维（3D）表示。对不同曝光时间的分析表明，等离子体的瞬态波动会导致实质性的不对称，只有在较长的曝光时间内，当发射的时间平均很重要时，才会接近对称。光谱数据允许对物种选择性激发和发射进行分析。在研究的空气等离子体流场中，原子和分子激发温度之间存在非平衡。原子电子激发温度的空间分布接近于旋转对称，而分子的旋转和振动温度则表现为不对称行为。
A method is presented allowing for locally resolved emission spectroscopy using a tomographic setup. The approach presented in this work is applied to a high enthalpy air plasma flow. The resulting data sets allow for a three-dimensional (3D) representation of the non-symmetric flow field using photographs of the test section and 2D representation of the spectrally resolved radiance of the flow field. An analysis of different exposure times shows that transient fluctuations of the plasma can result in substantial asymmetry that approaches symmetry only for longer exposure times when the temporal averaging of the emission is significant. The spectral data allows the analysis of species selective excitation and emission. A non-equilibrium between atomic and molecular excitation temperatures is concluded for the investigated air plasma flow field. The spatial distribution of atomic electronic excitation temperatures are close to rotational symmetry while molecular rotational and vibrational temperatures exhibit asymmetric behavior.