High-speed imaging system for observation of discharge phenomena
High-speed imaging system for observation of discharge phenomena
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DOI：
10.1117/12.822050
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发表时间：
2008-11
期刊：
影响因子：
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通讯作者：
R. Tanabe;H. Kusano;Y. Ito
中科院分区：
文献类型：
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作者：
R. Tanabe;H. Kusano;Y. Ito
在一次大电流放电中，薄金属电极尖端会立即改变形状，变成球形或针状。这些变化发生在几百微秒内。为了在单次放电中观察这些高速现象，构建了由高速摄像机和高重复频率脉冲激光器组成的成像系统。采用波长为532 nm的纳秒激光作为新型高速摄像机HPV-1的光源。系统的时间分辨率由激光脉冲宽度决定，约为80纳秒。该系统可以在一次放电事件中以16或64微秒的间隔拍摄100张照片。在相机前放置532 nm的带通滤波器，以阻挡放电弧在其他波长的发射。因此，即使在放电过程中，电极的清晰图像也被记录下来。如果不使用激光，只观察到放电时等离子体的图像和放电后电极的热辐射。这些结果表明，高重复率和短脉冲激光与高速摄像机的结合为高速成像提供了一种独特而有力的方法。
A thin metal electrode tip instantly changes its shape into a sphere or a needlelike shape in a single electrical discharge of high current. These changes occur within several hundred microseconds. To observe these high-speed phenomena in a single discharge, an imaging system using a high-speed video camera and a high repetition rate pulse laser was constructed. A nanosecond laser, the wavelength of which was 532 nm, was used as the illuminating source of a newly developed high-speed video camera, HPV-1. The time resolution of our system was determined by the laser pulse width and was about 80 nanoseconds. The system can take one hundred pictures at 16- or 64-microsecond intervals in a single discharge event. A band-pass filter at 532 nm was placed in front of the camera to block the emission of the discharge arc at other wavelengths. Therefore, clear images of the electrode were recorded even during the discharge. If the laser was not used, only images of plasma during discharge and thermal radiation from the electrode after discharge were observed. These results demonstrate that the combination of a high repetition rate and a short pulse laser with a high speed video camera provides a unique and powerful method for high speed imaging.