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Dual-Wavelength Interferometric Measurement of Electrically Exploded Aluminum and Copper Wires in Low-Pressure Air for Electron and Ion Density Calculation
IEEE Transactions on Plasma Science ( IF 1.5 ) Pub Date : 2020-09-01 , DOI: 10.1109/tps.2020.3018017
Andrew Hamilton , Michael A. Saville , Vladimir Sotnikov

Electron and atomic densities of Cu and Al plasmas in low-pressure air are studied using the recently reported dual-wavelength (1064 and 532 nm) interferometric diagnostic. The electrical explosion of a 99.999% pure, straight wire forms cylindrical plasma volumes within a low-pressure air chamber, and the probing lasers’ interferometry patterns are simultaneously recorded at prescribed times after wire explosion. The measurements are performed repeatedly from 50 to 1200 ns in 50-ns increments allowing the calculation of electron and ion densities and the observation of the plasma’s expansion and dissipation. The densities are calculated from fringe line analysis using a signal-processing-based algorithm that automatically extracts the fringe ratio. Finally, the maximum average volumetric electron and ion densities are calculated. The results of atomic density agree with past reports but are two orders greater than electron density, which suggests that full ionization is unattained.

中文翻译:

用于电子和离子密度计算的低压空气中电爆炸铝和铜线的双波长干涉测量

使用最近报道的双波长(1064 和 532 nm)干涉诊断研究了低压空气中 Cu 和 Al 等离子体的电子和原子密度。纯度为 99.999% 的直线电爆炸在低压空气室内形成圆柱形等离子体体积,并且在电线爆炸后的指定时间同时记录探测激光的干涉测量模式。测量从 50 到 1200 ns 以 50 ns 的增量重复执行,允许计算电子和离子密度并观察等离子体的膨胀和耗散。密度是使用基于信号处理的算法通过条纹线分析计算得出的,该算法可自动提取条纹比。最后,计算最大平均体积电子和离子密度。
更新日期:2020-09-01
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