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首页> 外文学位 >Development of impulse measurement techniques for the investigation of transient forces due to laser-induced ablation.
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Development of impulse measurement techniques for the investigation of transient forces due to laser-induced ablation.

机译：脉冲测量技术的发展，用于研究激光诱导的烧蚀引起的瞬态力。

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摘要

A torsional impulse balance has been developed as a new diagnostic tool to study fundamental physical processes in micropropulsion systems and laser-surface interactions. With respect to momentum transfer, direct measurements of the transient forces can lead to a better understanding and characterization of the efficiency of the thrust that is possible under different configurations. The impulse balance has been designed and tested with a robust calibration system to measure impulsive forces with resolution as low as a few nano-Newton-seconds. A technique has been developed to derive the measured force as a function of time. Although total delivered impulse is generally measured and deemed adequate for most applications, time resolved thrust measurements can provide deeper understanding and enhanced characterization of thruster operation for longer duration impulses or multiple pulse applications. In order to directly obtain the specific impulse, modified versions of the impulse balance have also been investigated to measure impulse and mass loss simultaneously.; Laser propulsion concepts have extensively been discussed since the early 1970s. Ranging from alternative launch solutions to on-orbit maneuvering systems for spacecraft, these concepts have employed an equally diverse range of momentum transfer mechanisms including ablation, shock wave generation, and even photon pressure. Within the scope of laser ablation, investigations of a wide variety of physical processes are of interest, which include sputtering, vaporization, and ionization. The conditions for which each physical process might occur and the controlling parameters can be studied by total impulse and time resolved force measurements. For a variety of metal and polymer materials, the impulses due to a range of pulse energies, fluences, pulsewidths, wavelengths, and repetition rates have been investigated. A number of methods for determining the ablated mass have also been examined in order to determine the specific impulse of the target materials and characterize the materials as possible propellant sources for space propulsion applications.
机译：扭转脉冲平衡已经被开发为一种新的诊断工具，用于研究微推进系统中的基本物理过程以及激光表面相互作用。关于动量传递，直接测量瞬态力可导致更好地理解和表征在不同配置下可能产生的推力效率。脉冲天平已设计并通过强大的校准系统进行了测试，以测量分辨率低至几纳牛顿-秒的脉冲力。已经开发出一种技术来导出测得的力随时间的变化。尽管通常测量输送的总脉冲并认为对大多数应用是足够的，但对于较长时间的脉冲或多脉冲应用，时间分辨推力测量可以提供更深入的了解，并增强推力器操作的特性。为了直接获得特定的脉冲，还研究了脉冲平衡的修改版本以同时测量脉冲和质量损失。自1970年代初以来，激光推进的概念已被广泛讨论。从替代的发射解决方案到航天器的在轨操纵系统，这些概念都采用了同样多样的动量传递机制，包括消融，冲击波产生，甚至是光子压力。在激光烧蚀的范围内，对各种物理过程的研究是令人关注的，包括溅射，汽化和电离。可以通过总冲量和时间分辨力的测量来研究每个物理过程可能发生的条件和控制参数。对于各种金属和聚合物材料，已经研究了由于一系列脉冲能量，注量，脉冲宽度，波长和重复频率引起的脉冲。为了确定目标材料的比冲，并确定这些材料作为用于空间推进应用的可能的推进剂源，还对确定消融质量的许多方法进行了检查。

著录项

  • 作者

    D'Souza, Brian Charles.;

  • 作者单位

    University of Southern California.$bAerospace Engineering.;

  • 授予单位 University of Southern California.$bAerospace Engineering.;
  • 学科 Engineering Aerospace.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 124 p.
  • 总页数 124
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;工程材料学;
  • 关键词

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