Digital smoothing of the Langmuir probe I-V characteristic.
Digital smoothing of the Langmuir probe I-V characteristic.
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DOI：
10.1063/1.2956970
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发表时间：
2008-07
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影响因子：
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通讯作者：
Fridrik Magnus;Jon Tomas Gudmundsson
中科院分区：
文献类型：
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作者：
Fridrik Magnus;Jon Tomas Gudmundsson
静电探针或朗缪尔探针是等离子体放电中最常见的诊断工具。朗缪尔探针I-V特性的二阶导数与电子能量分布函数成正比。精确地确定二阶导数需要某种噪声抑制方法。我们比较了Savitzky-Golay滤波器，高斯滤波器，多项式拟合的Blackman滤波器的数字平滑模拟和测量的I-V特性。我们发现，布莱克曼滤波器实现了最平滑的噪声数据的失真最小。
Electrostatic probes or Langmuir probes are the most common diagnostic tools in plasma discharges. The second derivative of the Langmuir probe I-V characteristic is proportional to the electron energy distribution function. Determining the second derivative accurately requires some method of noise suppression. We compare the Savitzky-Golay filter, the Gaussian filter, and polynomial fitting to the Blackman filter for digitally smoothing simulated and measured I-V characteristics. We find that the Blackman filter achieves the most smoothing with minimal distortion for noisy data.