The dielectric behaviour of snow: A study versus liquid water content
The dielectric behaviour of snow: A study versus liquid water content
复制标题
雪的介电行为：与液态水含量的研究
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
A. Denoth
中科院分区：
文献类型：
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作者：
W. Ambach;A. Denoth
雪被视为由冰、空气和水组成的非均质介电材料。干雪和水的高频相对介电常数的较大差异使得通过测量雪的相对介电常数来确定液态水的含量。利用体积约为1000 cv cm的平板冷凝器测量雪体中平均液态水含量。校正使用冷冻量热计。为了测量薄雪层中液态水的含量，研制了一种梳状冷凝器，它是板式冷凝器的二维类似物。该湿度计以几毫米厚的层为单位测量液态水的含量，其中有效测量深度由电场线的穿透深度给出，该深度由条带线的间距控制。给出了平板式冷凝器和梳状冷凝器两种湿度仪的现场测量结果。
Snow is treated as a heterogeneous dielectric material consisting of ice, air, and water. The greater difference in the high frequency relative permittivity of dry snow and water allows to determine the liquid water content by measurements of the relative permittivity of snow. A plate condenser with a volume of about 1000 cv cm was used to measure the average liquid water content in a snow volume. Calibration was carried out using a freezing calorimeter. In order to measure the liquid water content in thin snow layers, a comb-shaped condenser was developed, which is the two dimensional analogon of the plate condenser. With this moisture meter the liquid water content was measured in layers of a few millimeters in thickness, whereby the effective depth of measurement is given by the penetration depth of electric field lines which is controlled by the spacing of the strip lines. Results of field measurements with both moisture meters, the plate condenser and the comb-shaped condenser, are given.