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调焦是高能激光系统中发射聚焦装置的关键一环。调焦机构对系统的瞄准和打击精度有着重要作用。为了解调焦机构的研究现状和发展趋势,首先对国外各类研究成熟的调焦机构进行了介绍,并分析了其调焦控制的原理以及针对各类技术问题所提出的解决方案。对于国内研究情况,则着重介绍了凸轮、丝杠、蜗轮蜗杆和直接驱动四种形式的调焦机构。然后分析了其控制调焦的基本原理,并介绍了应用于不同系统的调焦机构的设计特点。通过分析各类型调焦机构的设计及控制,总结和对比了它们的优点与不足,提出了适用于高能激光系统的调焦机构设计思路及研究方向,为高能激光系统调焦机构研究打下了技术基础。 相似文献
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A Direct Comparison between Static and Dynamic Melting Temperature Determinations below 100 GPa 总被引:1,自引:0,他引:1
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A preliminary experiment of sound velocity measurements for porous iron with initial average density of 6.275 g/cm^3 has been performed at pressures below 100 CPa, in order to clarify a long-standing problem that the static melting temperature Tin, mostly below 100CPa due to its technical limitations, is notably lower than the extrapolated melting data inferred from the shock wave experiments made above 200 CPa, for the sake of making a direct comparison between the experimental static and dynamic melting temperatures in the same pressure region. With the lately proposed Hugoniot sound velocity data analysis technique [Chin. Phys. Left. 22 (2005) 863], the results deduced from this Hugoniot sound velocity measurement is Tm = 3200 K at 87 CPa and Tm = 3080 K at 80 GPa, which are in good agreement with the two latest static data of Tm = 3510 K at 105 GPa and Tm = 2750 K at 58 GPa, which utilized modern improved double-side laser heating and in situ accurate x-ray diffraction techniques in experiments. It can be concluded that consensus Tm data would be obtained from static and shock wave experiments in the case that the recently improved techniques are adopted in investigations. 相似文献
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