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基于高功率激光装置对脉冲氙灯工程运行可靠性的要求,利用现有的能源模块开展了氙灯放电考核实验。实验结果表明:虽然氙灯运行在安全的能量负载水平,当能源模块单个放电回路的峰值功率超过300MW时,氙灯石英玻璃管壁存在热损伤风险。肉眼观察到管壁损伤后在反射器对侧的灯管内壁出现乳白色沉积层。经扫描电镜和X射线光电子能谱测试分析,证实热损伤形成的乳白色沉积物为二氧化硅。为探究管壁热损伤机制,采用高速摄影观测了氙灯放电等离子体沟道发展过程。图像显示放大器内金属反射器的几何形状对放电沟道的分布产生了显著影响,尤其是在侧灯箱,灯内电弧沟道会靠近反射器一侧集中分布,因此,导致等离子体对灯管的偏烧。当放电峰值功率超过石英热负载极限时,管壁表面二氧化硅材料会被烧蚀至蒸发、气化,并随后沉积在灯管较冷部位。研究结果表明放电回路的放电峰值功率过高、放大器内金属反射器均会对氙灯造成热损伤。
Based on the requirement of high power laser device for the operation reliability of pulsed xenon lamp, xenon lamp discharge test was carried out by using the existing energy module. The experimental results show that although the xenon lamp operates at a safe energy load level, there is a risk of thermal damage to the quartz glass tube wall of the xenon lamp when the peak power of a single discharge loop of the energy module exceeds 300 MW. Visually observed after the tube wall damage in the opposite side of the reflector tube milky white deposit. Scanning electron microscopy and X-ray photoelectron spectroscopy test analysis confirmed that the milky white deposit formed by thermal damage was silica. In order to explore the thermal damage mechanism of tube wall, the developing process of xenon lamp discharge plasma channel was observed by high-speed photography. The geometry of the metal reflector in the image display amplifier has a significant effect on the distribution of the discharge channels, especially in the side light boxes, where the arc channels are concentratedly distributed close to the reflector. As a result, Partial burning. When the discharge peak power exceeds the thermal load limit of quartz, the silica wall material on the tube wall will be ablated to evaporate, gasify, and then be deposited on the cooler sections of the tube. The results show that the discharge circuit discharge peak power is too high, the metal reflector within the amplifier will cause thermal damage to the xenon lamp.