超高速碰撞产生电磁辐射的微波诊断

Microwave diagnosis of electromagnetic radiation produced by hypervelocity impact

为了诊断超高速碰撞产生的电磁辐射,建立了超高速碰撞产生电磁辐射的实验和微波诊断系统。利用建立的微波诊断系统,进行了碰撞速度分别为4.60和4.66km/s条件下超高速碰撞LY12铝靶产生电磁辐射的微波诊断,分析了实验中产生电磁辐射与靶板厚度及裂纹数的关系。实验结果表明:在实验条件相近的情况下,靶板厚度越小,产生的微波辐射强度越大;微波辐射功率正比于碰撞产生的微裂纹数。同时揭示了热激发产生电子和裂纹的存在为超高速碰撞产生电磁辐射的物理机制。

In order to diagnose electromagnetic radiation generated by hypervelocity impact, the experimental and microwave diagnostic system for the electromagnetic radiation was established. Experimental diagnostics of electromagnetic radiation generated by impacting LY12 aluminum target were finished by using the microwave diagnostic system under loading velocities of 4.60 and 4.66 km/s separately. The relationship between electromagnetic radiation and target thickness was analyzed in the experiments. Experimental results show that, the microwave radiation intensity is large, when target thickness is small; the power of microwave radiation was proportional to the microcrack number generated by hypervelocity impact. Meanwhile, the physical mechanism of electromagnetic radiation generated by hypervelocity impact can be explained as thermal excitation produced electron and existence of crack created by impact.