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激光驅動飛片速度的理論分析

Theoretical analysis on the velocity of laser-driven flyer

  • 摘要: 激光驅動飛片技術是模擬微流星體/空間碎片對航天器外露材料/部件超高速撞擊，用于開展撞擊累積損傷效應與材料性能退化的研究，也是進行航天器在軌壽命預估和空間碎片防護研究的重要技術手段。飛片速度是衡量激光驅動飛片技術水平的關鍵性參數(shù)之一。文章從Lawrence改進的Gurney模型出發(fā)，著重分析了激光輸出能量、脈寬、聚焦光斑大小以及飛片靶厚度等參數(shù)與飛片速度大小的關系，提出激光驅動飛片技術中提高飛片速度的主要途徑：其他條件一定時，薄靶較厚靶更易獲取高速飛片；小光斑較大光斑更易獲取高速飛片；長脈寬高能激光器或短脈寬低能激光器比較適合獲取高速飛片。以上結論對從試驗上獲取高速飛片具有重要指導意義。

     

    Abstract: The laser-driven flyer (LDF) technique is widely used to simulate micro meteoroids and orbital debris (M/OD) with respect to their hypervelocity impacting effects. The flyer velocity is one of the key parameters of LDF and it is influenced by many factors. This paper analyzes the relationships between the flyer velocity and the laser energy, the width of laser pulse, the diameter of laser focal spot, and the flyer thickness based on Lawrence-Gurney model. Higher velocity flyer is obtained by using thinner target or smaller laser focal spot. At the same time, long pulse-high energy or short pulse-low energy laser are preferred in those experiments. These relations may help to obtain high velocity flyers in the LDF experiment.

     

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