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532nm/1064 nm激光烧蚀铝靶冲量耦合特性实验研究
空间碎片清除 激光烧蚀 冲量耦合 激光推进
2018/3/12
激光清除空间碎片技术在厘米级空间碎片清除中具有重要的应用前景。进行了激光烧蚀典型空间碎片材料的冲量耦合特性实验研究。实验中采用532 nm/1 064 nm波长，8 ns/15 ns脉宽的激光烧蚀金属铝靶材，运用扭摆测试系统测量了烧蚀冲量，并分析了不同激光参数对冲量耦合系数的影响。实验结果表明，铝靶冲量耦合系数随着激光功率密度的增加是先上升后下降的变化趋势，存在最优冲量耦合系数；激光烧蚀铝靶过程以...
镀锌高强钢激光焊接气孔形成机理
激光焊接 镀锌高强钢 锌蒸汽 气孔
2018/3/12
气孔是镀锌钢板焊接的主要缺陷。为深入研究镀锌高强钢板（DP780）的镀锌层在激光焊接过程中气孔产生的机理，采用高速摄像机观察焊接过程中锌蒸汽的逃逸过程和渠道，总结了内部气孔和外部气孔的形成机理，并基于气孔形成机理总结了锌蒸汽逃逸的二个通道动态平衡的控制方法。通过对焊接功率和焊接速度等工艺参数下的锌蒸汽逃逸过程观察和气孔实际形成率的分析试验，证明控制锌蒸汽二个逃逸通道的动态平衡能降低焊接接头气孔率。...
ACCURACY ANALYSIS OF THE LEICA HDS3000 AND FEASIBILITY OF TUNNEL DEFORMATION MONITORING
terrestrial laser scanning accuracy analysis change detection
2015/8/13
Deformation monitoring with total stations, while superior in accuracy, suffers from the poor spatial resolution obtainable by this
measurement method within the limited time on a tunnel construction...
VISUALIZATION AND ANALYSIS OF FULL-WAVEFORM AIRBORNE LASER SCANNER DATA
Airborne laser scanning LIDAR laser data processing
2015/8/13
Recent development of airborne laser scanner systems allows for digitization and recording of the full-waveform, i.e. the received
signal of the reflected laser pulse. In this paper, some visualizat...
Study of Solar Pumped Laser for Fossil-fuel-free Energy Cycle Using Magnesium
Solar pumped laser Fresnel lens Nd YAG
2009/6/1
A new type of solar pumped laser system that has features of high-efficiency and low cost due to the use of a Fresnel lens and a Cr codoped Nd:YAG ceramic laser medium is reported in this paper. Slope...
Development of Driver Laser System for 0.1-Hz X-ray Laser
X-ray laser CPA Zigzag slab Nd:glass amplifier
2009/6/1
New driver laser system for the 0.1-Hz x-ray laser is described. The driver laser is based on CPA laser with Nd:glass power amplifier. By using flash lamp pumped zigzag slab amplifier, energy extracti...
Modeling of the Atomic Processes and Photo Emission of the Plasmas for the EUV Source
Laser produced plasmas EUV Atomic process
2009/6/1
A study of the coefficient of radiative transfer of Sn plasmas for the extreme ultra-violet (EUV) light source is presented. The atomic data of near 10 times ionized Sn ions are calculated using the H...