激光触发真空开关光谱和导通特性实验研究

发布时间：2018-07-03 08:43

本文选题：光谱学 + 激光触发真空开关特性　；参考：《激光技术》2017年01期

【摘要】：为了研究激光触发真空开关的靶材激光诱导击穿光谱和电弧光谱,分析影响时延抖动的微观因素,利用单脉冲纳秒激光轰击位于开关阴极的靶材激发等离子体,采用滤光片和光电倍增管组合使用的方法,取得了离散波长光强的数据,建立拟合曲线,进行了理论分析。结果表明,脉冲激光能量增大可以提高靶材激光诱导击穿光谱的强度,但几乎不影响电弧光谱的强度;增大开关两端电压可以提高电弧光谱强度;在开关强电场作用下,电弧等离子体碰撞激发,等离子体的成分比例随电压大小发生变化;时延抖动与电压大小无关,与自由电子运动状态和电弧离子种类无关,主要在触发阶段受影响,而相比激光能量,开关电压大小对导通时的电压下降沿陡度起主要作用。这一结果对激光触发真空开关中激光与靶材相互作用、脉冲电弧和时延抖动的进一步研究是有帮助的。
[Abstract]:In order to study the laser induced breakdown spectrum and the arc spectrum of the laser triggered vacuum switch, the microcosmic factors affecting the delay jitter are analyzed. A single pulse nanosecond laser is used to bombard the plasma in the target of the switch cathode, and the method of combination of filter and photomultiplier is used to obtain the data of the discrete wavelength light intensity. The results show that the increase of the pulse laser energy can increase the intensity of the laser induced breakdown spectrum of the target, but it can hardly affect the intensity of the arc spectrum. The increase of the voltage of the two ends of the switch can increase the intensity of the arc spectrum. The time delay jitter is independent of the size of the voltage and is independent of the motion state of the free electron and the type of the arc ion. It is mainly affected in the trigger stage, and the voltage of the switching voltage is mainly used for the voltage drop along the steepness compared with the laser energy. This result is a result of laser triggered vacuum switch laser. Further research on pulse arc and time delay jitter is helpful.
【作者单位】：华中科技大学激光技术国家重点实验室;华中科技大学电气与电子工程学院;国家电网天津市电力公司城东公司;
【基金】：国家自然科学基金资助项目(51377071)
【分类号】：TN249;TM564

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