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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A systematic study of light scattering by aggregate particles using the microwave analog technique: Angular and wavelength dependence of intensity and polarization
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A systematic study of light scattering by aggregate particles using the microwave analog technique: Angular and wavelength dependence of intensity and polarization

机译：使用微波模拟技术对聚集颗粒的光散射进行系统研究：强度和偏振的角度和波长依赖性

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摘要

Microwave analog experiments [e.g., Gustafson, 1996a, 1999] allow us to simulate light-scattering properties of particles of almost any combination of composition, size, and shape. We have taken advantage of this ability and the broadband nature of the University of Florida microwave facility in a systematic study of light scattering by aggregates. We present angular dependencies of intensity and polarization in the scattering angle range 0 deg - 165 deg, and in the wavelength interval 2.7-4 mm, which simulates 0.430-0.660 #mu#m in the visual. The data are for a variety of sizes, shapes, and compositions of the constituent particles, as well as the number of particles in an aggregate and their packing. Wavelength dependencies are shown to be powerful diagnostics for the interpretation of comet dust observations and we urge observers to report color and polarimetric color. As an example, we estimate the size of constituent particles in cometary grains (0.1-1 #mu#m). We also show that the grains evolve with the distance from the nucleus and that the reason apparently is the loss of some dark matter. Techniques and results reported here are general enough to apply to a broad range of natural and artificial aggregates.
机译：微波模拟实验[例如，Gustafson，1996a，1999]使我们能够模拟几乎任何成分，大小和形状组合的粒子的光散射特性。在对聚集体光散射的系统研究中，我们利用了佛罗里达大学微波设施的这种能力和宽带特性。我们在散射角范围0度至165度以及波长间隔2.7-4 mm（在视觉中模拟0.430-0.660＃mu＃m）中显示了强度和偏振的角度依赖性。数据涉及组成颗粒的各种尺寸，形状和组成，以及聚集体中的颗粒数量及其堆积。波长依赖性被证明是解释彗星尘埃观测的有力诊断工具，我们敦促观察者报告颜色和偏振色。例如，我们估算彗星颗粒中构成颗粒的大小（0.1-1＃μ＃m）。我们还表明，晶粒随着与核的距离的增长而演化，其原因显然是某些暗物质的损失。此处报道的技术和结果具有足够的通用性，可适用于各种天然和人工骨料。

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