蓝宝石内部缺陷点在冲击压缩下的热点效应

Hot-Spot Effect of Local Defects in Shocked Sapphire Crystal

以蓝宝石晶体为代用材料,利用飞秒激光内雕的方法在其内部人为制造缺陷点,利用辐射高温计测量在冲击压缩下缺陷点光辐射强度和温度的变化过程,分析内部热点的形成和发展过程。结果表明,相对于没有缺陷的情况,有缺陷点的样品内部形成了热点,并且热点的光辐射强度明显增强,温度也快速升高,其辐射驰豫时间约200 ns。建立了进一步研究炸药中热点生成和传播的新实验方法。

Explosive materials is replaced by sapphire crystal and a defect induced hot-spot is fabricated in the sapphire crystal by femtosecond laser ablation. The optical radiation and temperature of hot-spot are measured by pyrometer, and this measurement results can be used to analyze the formation and prapagation of hot-spot. The results demonstrate that the more intensed optical radiation and higher temperature will be emitted from the hot- spot in shocked heterogeneous sapphire than that in the shocked homogeneous sapphire. The growth and decay of the hot-spot is very fast and the total duration of the hot-spot is about 200 nanoseconds. A novel experimental method for further studying the formation and prapagation of hot-spot in explosive materials is established.