临近空间飞行器等离子体鞘套的太赫兹波穿透特性

临近空间高超声速飞行器再入过程中会产生等离子体鞘套,干扰电磁波对飞行器的探测.针对这一问题,对典型临近空间飞行器模型进行建模,模拟其再入过程中不同飞行工况下的流场分布.基于流场分布对等离子体参数分布进行建模,利用散射矩阵方法从理论上对太赫兹波在等离子体鞘套中的传输特性进行计算.计算结果表明高频太赫兹波能够有效穿透等离子...

Terahertz wave propagation characteristics in the plasma sheath of near space vehicle

Plasma sheath formed during the reentry of near space hypersonic vehicle will interfere the electromagnetic wave detection. In order to solve this problem, the model of the typical near space vehicle was built, and the flow field distribution under different flight conditions during the reentry process was simulated. Based on the flow field distribution, the plasma parameter distribution was modeled, and the transmission characteristics of terahertz wave in the plasma sheath were theoretically calculated by using the scattering matrix method. The results show that high frequency terahertz wave can penetrate plasma sheath effectively. In addition, terahertz active imaging experiments were carried out in the laboratory environment. The experimental results show that the plasma exerts little effect on the terahertz active imaging results. The simulation and experimental results preliminarily prove the potential of terahertz technology for hypersonic vehicle detection, which is of great significance for national defense.