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Time-resolved temperature measurements in hypervelocity dust impact

机译:高速尘埃撞击中的时间分辨温度测量

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摘要

We present time-resolved temperature measurements of the debris cloud generated by hypervelocity dust impact. Micron- and submicron-sized iron grains were accelerated to speeds of 1-32 km/s using the 3 MV electrostatic dust accelerator at the Colorado Center for Lunar Dust and Atmospheric Studies, and impacted on a tungsten target. The resulting light flashes were analyzed by an array of photomultiplier tubes equipped with narrowband interference filters to determine the blackbody temperature and radiant power of the impact-generated cloud as a function of time. We find time-averaged temperatures in the range of 2500-5000 K, increasing with velocity over the range studied; initial temperatures up to approximately twice the time averaged temperature persisting on short timescales (<1 μs) compared to the 20 μs duration of the flash; and that the temperature falls in a manner consistent with radiative cooling.
机译:我们提出了由超高速尘埃撞击产生的碎片云的时间分辨温度测量结果。在科罗拉多州月尘与大气研究中心,使用3 MV静电除尘器将微米级和亚微米级的铁晶粒加速至1-32 km / s的速度,并撞击到钨靶上。所产生的闪光由装有窄带干涉滤光片的光电倍增管阵列进行分析,以确定随时间变化的冲击产生的云的黑体温度和辐射功率。我们发现时间平均温度在2500-5000 K范围内,在研究的范围内随速度增加;初始温度大约是在短时间范围内(<1μs)持续的时间平均温度的两倍,而闪光灯的持续时间为20μs。并且温度以与辐射冷却一致的方式下降。

著录项

  • 来源
    《Planetary and space science》 |2013年第12期|58-62|共5页
  • 作者单位

    Colorado Center for Lunar Dust and Atmospheric Studies, LASP, University of Colorado at Boulder, Boulder, CO, USA;

    Colorado Center for Lunar Dust and Atmospheric Studies, LASP, University of Colorado at Boulder, Boulder, CO, USA;

    Colorado Center for Lunar Dust and Atmospheric Studies, LASP, University of Colorado at Boulder, Boulder, CO, USA;

    Colorado Center for Lunar Dust and Atmospheric Studies, LASP, University of Colorado at Boulder, Boulder, CO, USA ,Aerospace Engineering Sciences, University of Colorado at Boulder, Boulder, CO, USA;

    Colorado Center for Lunar Dust and Atmospheric Studies, LASP, University of Colorado at Boulder, Boulder, CO, USA ,Department of Physics, University of Colorado at Boulder, Boulder, CO, USA;

    Colorado Center for Lunar Dust and Atmospheric Studies, LASP, University of Colorado at Boulder, Boulder, CO, USA ,Department of Physics, University of Colorado at Boulder, Boulder, CO, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Moon; Dust; Impact; Light flash; Plasma; Meteoroid;

    机译:月亮;灰尘;影响;闪光灯;等离子体;流星体;

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