Ultra‐High Fidelity Laser‐Induced Air Shock from Energetic Materials,Propellants, Explosives, Pyrotechnics

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Ultra‐High Fidelity Laser‐Induced Air Shock from Energetic Materials
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2019-11-18 , DOI: 10.1002/prep.201900130
Matthew M. Biss ₁ , Kathryn E. Brown ₁ , Christopher F. Tilger ₁

Affiliation

Recent interest in the implementation of the Laser‐induced Air Shock from Energetic Materials (LASEM) technique prompted an investigation using ultra‐high‐speed imaging diagnostics to provide early‐time (sub‐μs) shock‐wave‐radius‐versus‐time data necessary to accurately determine the characteristic laser‐induced‐shock velocity (y‐intercept) for high explosives (HE) of interest. Ultra‐high‐speed focused‐shadowgraphy images were collected from nanosecond‐pulsed laser‐ablated samples of HE similar to those in the published literature. Shadowgraphy images were collected using interframe times ranging from 50–750 ns, with exposure times of 5 ns. Acquired shock‐wave‐radius‐versus‐time data permitted a high‐fidelity assessment of the shock wave velocity produced at the characteristic radius of the generated laser‐plasma pulse. The resulting data from eight different HE indicated that early‐time energy contributions and the resulting laser‐induced shock velocity profiles produced from ablation of the HE material were indistinguishable amongst the explosives tested for the majority of the time domain characterized (0–12 μs).

中文翻译：

含能材料的超高保真激光诱发的空气冲击

最近对高能材料引起的激光引起的空气冲击（LASEM）技术的实施兴趣促使人们进行了使用超高速成像诊断程序的调查，以提供早期（μs）的冲击波半径与时间的对比数据。准确确定目标高爆炸物（HE）的特征性激光诱导的冲击速度（y截距）所必需。纳秒脉冲激光烧蚀的HE样品中收集的超高速聚焦阴影图像与已发表的文献相似。皮影图像是使用50-750 ns的帧间时间收集的，曝光时间为5 ns。所获得的冲击波半径与时间的数据可以对在产生的激光等离子体脉冲的特征半径处产生的冲击波速度进行高保真评估。

更新日期：2020-03-22

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