Spatial distribution of gas-phase synthesized germanium nanoparticle volume-fraction and temperature using combined in situ line-of-sight emission and extinction spectroscopy.
Spatial distribution of gas-phase synthesized germanium nanoparticle volume-fraction and temperature using combined in situ line-of-sight emission and extinction spectroscopy.
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DOI：
10.1364/oe.418922
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发表时间：
2021-03
期刊：
影响因子：
3.8
通讯作者：
Guannan Liu;M. Asif;J. Menser;T. Dreier;K. Mohri;C. Schulz;T. Endres
中科院分区：
文献类型：
--
作者：
Guannan Liu;M. Asif;J. Menser;T. Dreier;K. Mohri;C. Schulz;T. Endres
在这项研究中，发射光谱和消光光谱相结合，原位测量温度和体积分数分布的液相锗纳米颗粒气相合成的氩气/氢气/锗烷流通过微波等离子体。热粒子的发射和连续背景下的消光分别由光谱仪在380-703 nm和230-556 nm范围内记录，基于材料的特定光学性质进行选择。通过最小二乘算法从视线衰减（LOSA）测量中对吸收系数进行去卷积，然后用于确定局部体积分数分布。温度场是从吸收系数的先验知识的视线发射（LOSE）光谱。多波长的重建模型的开发用于确定的空间分辨分布的测量量假设一个固定的轴对称流。该方法的优点包括实验简单，成本低，并适应放大的反应器尺寸。
In this study, emission and extinction spectroscopy were combined to in situ measure temperature and volume fraction distributions of liquid germanium nanoparticle gas-phase synthesized in an argon/hydrogen/germane flow through a microwave plasma. Emission of the hot particles and extinction against a continuous background were recorded by a spectrometer in the 380-703 nm and 230-556 nm ranges, respectively, selected based on the specific optical properties of the material. Absorption coefficients were deconvoluted from line-of-sight attenuation (LOSA) measurements by a least-square algorithm and then used to determine the local volume fraction distribution. The temperature field was derived from the line-of-sight emission (LOSE) spectra with the prior knowledge of absorption coefficients. A multi-wavelength reconstruction model was developed for the determination of the spatially-resolved distribution of the measured quantities assuming a stationary axisymmetric flow. Advantages of the method include experimental simplicity, low cost, and adaptability to up-scaled reactor sizes.