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Microwave beam diagnostic of laser-induced plasmas.

机译:激光诱导等离子体的微波诊断。

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摘要

This thesis describes the use of micro-impulse radar to detect laser-induced plasmas. The MIR actively interrogates the plasma to produce a reflected microwave signal from the plasma, and the device also detects the acoustic signature of the plasma. The acoustic MIR signal is similar to the signal received by a piezoelectric microphone. We show that the magnitudes of both MIR signals are proportional to the plasma intensity as well as to emission line intensities of elements in the plasma. Thus, the MIR, like the microphone signal, can be used to normalize the emission signal to compensate for variations in laser energy. Element concentration studies show that though the laser power can be compensated using the reflected or acoustic signal, they do not correct as well for variation in emission intensity as the concentration is changed. This result suggests that variations in emission like intensity are not solely due to laser power fluctuations.
机译:本文介绍了使用微脉冲雷达检测激光诱导的等离子体。 MIR主动询问等离子体以从等离子体产生反射的微波信号,并且该设备还检测等离子体的声学特征。 MIR声学信号类似于压电麦克风接收的信号。我们表明,两个MIR信号的大小都与等离子体强度以及等离子体中元素的发射线强度成正比。因此,MIR像麦克风信号一样,可以用于归一化发射信号,以补偿激光能量的变化。元素浓度研究表明,尽管可以使用反射或声信号补偿激光功率,但是随着浓度的改变,它们也无法针对发射强度的变化进行校正。该结果表明,发射强度的变化不仅是由于激光功率波动引起的。

著录项

  • 作者

    Copenhaver, Ardis Marie.;

  • 作者单位

    University of South Carolina.;

  • 授予单位 University of South Carolina.;
  • 学科 Chemistry Analytical.
  • 学位 M.S.
  • 年度 2010
  • 页码 53 p.
  • 总页数 53
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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