【摘要】 采用单脉冲激光进行了大气环境下激光烧蚀小钢珠实验,得到其推进效应参数,发现并分析了钢珠在不同放置位置(焦前与焦后)时不同的物理现象;为了得到一系列定量实验数据,采用自行研制的激光冲量靶仪进行了单脉冲激光烧蚀推进效应实验测试,得到了不同环境条件、不同靶材料的激光推进效应参数,并与国外的实验数据以及数值计算结果进行了比较。实验表明,靶材料和激光功率密度是影响冲量耦合系数的主要因素,冲量耦合系数随环境气压的降低而升高。更多还原

【Abstract】 Experiments that use single-pulse laser to ablate small steel ball in atmosphere were conducted. In these experiments, the propulsion efficiency parameters were obtained and different phenomena for the steel ball in front and back of the focus were analyzed in detail. To get a series of experiment data, experiments for different ambient conditions and different target materials were conducted and the propulsion parameters were obtained, and the experiment data were compared with those of overseas and numerical results.Experimental results showed that the material of target and the laser intensity were the main factors influenced the mechanical coupling coefficient(c_m), and the c_m value increased a few with the decreased of ambient pressure.更多还原