Application of phase-modulated dispersion interferometry to electron-density diagnostics of high-pressure plasma
Application of phase-modulated dispersion interferometry to electron-density diagnostics of high-pressure plasma
复制标题
相位调制色散干涉技术在高压等离子体电子密度诊断中的应用
DOI：
10.1088/0022-3727/47/26/262001
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and K. Terashima
中科院分区：
文献类型：
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作者：
K. Urabe;T. Akiyama;and K. Terashima
相位调制色散干涉测量法 (PMDI) 是一种测量等离子体中电子密度的技术，最初是为大型聚变反应堆开发的。在本文中，我们展示了 PMDI 在高压下产生的微等离子体诊断方面的潜力。 PMDI可以消除折射率变化中的非色散成分对测量的影响；因此，由气体密度变化引起的大部分折射率变化可以通过信号处理消除，从而有助于精确测定微等离子体中的电子密度。对常压氦气流中的脉冲直流微等离子体的测量结果表明，微等离子体的电子密度在4×10 13 和1.4×10 14 cm−3之间，我们的PMDI系统的时间分辨率为110μs，线积分电子密度的灵敏度为7×10 11 cm−2。
Phase-modulated dispersion interferometry (PMDI) is a technique for measuring the electron density in plasmas that was first developed for large fusion reactors. In this paper, we demonstrate the potential of PMDI for the diagnostics of microplasma generated at high pressures. PMDI can eliminate the effect of nondispersive components in the refractive-index variation on the measurement; therefore, most of the variation of the refractive index induced by the variation of gas density is eliminated by signal processing, contributing to accurate electron-density determination in microplasmas. The measurement results for a pulsed-dc microplasma in an atmospheric-pressure helium gas flow revealed that the electron density of the microplasma was in the range between 4× 10 13 and 1.4× 10 14 cm− 3, and our PMDI system had a temporal resolution of 110µs and a sensitivity of the line-integrated electron density of 7× 10 11 cm− 2.