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首页> 外文会议>Annual Report Conference on Electrical Insulation and Dielectric Phenomena >Exploration of Self-Produced Vacuum Ultraviolet Radiation from Dielectric Surface Flashover at Atmospheric Pressure
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Exploration of Self-Produced Vacuum Ultraviolet Radiation from Dielectric Surface Flashover at Atmospheric Pressure

机译：自制作真空紫外线辐射在大气压下自制作真空紫外线辐射

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This paper describes recent experiments to study selfproduced vacuum ultraviolet (VUV) emission from pulsed atmospheric plasma structures. While it has been classically believed that photo-ionization plays a significant role on plasma generation during fast timescales (i.e. streamers), the exact role of VUV radiation (energy greater than 7 eV) has only recently been explored and is currently an area of interest for the development of high power devices in the aerospace community. Since VUV emission is heavily absorbed by molecular oxygen and most optical materials, the direct observation of VUV radiation produced by atmospheric pressure plasmas is challenging. Experiments at Texas Tech University were performed with multiple vacuum monochromators, custom designed VUV transparent optical instruments, VUV sensitive intensified CCD and photomultiplier time-resolved diagnostics, and nanosecondtimescale electrical probes of the plasma. Previous studies were limited due to the non-linearity of the focusing optics used for VUV transmission, and thus the current experiment was designed to minimize chromatic abberation of recorded emission n the VUV regime of interest (115 - 135 nm). Quantitative observation of VUV emission from surface flashover in air revealed that the majority of emission is due to radiation from atomic oxygen and nitrogen in the wavelength range 130 - 135 nm, which has been confirmed by spectral calculation for an estimated Boltzmann temperature of 10 eV. High resolution spectral measurements in the range 115 - 130 nm also led to bservation of various impurities along the surface, which were nly observable due to the upgraded focusing system. Finally, ime resolved measurements showed that the earliest VUV mission occurs during the streamer phase, where the recorded ignal-to-noise ratio of the observed emission has been ignificantly increased due to more efficient optical diagnostics.
机译：本文介绍了研究自我证实的脉冲大气血浆结构的自我抑制真空紫外线（VUV）发射的实验。虽然已经掌握了光电离子化在快速时间尺度（即飘带）期间对等离子体产生起显着作用，但最近仅探索了VUV辐射（大于7eV）的确切作用，目前是一个感兴趣的领域用于航空航天界高功率器件的发展。由于VUV排放受到分子氧和大多数光学材料的严重吸收，因此通过大气压等离子体产生的VUV辐射的直接观察是具有挑战性的。德克萨斯科技大学的实验是用多个真空单色器进行的，定制设计的VUV透明光学仪器，VUV敏感的CCD和光电倍增者时间分辨诊断，以及纳秒的等离子体电探针。由于用于VUV变速器的聚焦光学器件的非线性，因此目前的实验设计了以前的研究是有限的，因此设计了目前的实验，以最小化记录发射的色彩缩写N的感兴趣的VUV制度（115-135nm）。空气中表面闪光辊的VUV排放的定量观察显示大多数发射是由于波长范围130-135nm中的原子氧和氮的辐射，这已经通过光谱计算得到了10eV的估计Boltzmann温度的谱计算。 115-130nm范围内的高分辨率光谱测量也导致沿着表面的各种杂质，这是由于升级的聚焦系统而被Nly观察到的。最后，IME解决的测量结果表明，由于更有效的光学诊断，所观察到的发射的记录的Ingl-噪声比的最早的VUV任务发生了最早的VUV任务。

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