Precise measurement of dielectric anisotropy in ice Ih at 39 GHz
Precise measurement of dielectric anisotropy in ice Ih at 39 GHz
复制标题
在 39 GHz 下精确测量冰 Ih 中的介电各向异性
DOI：
10.1063/1.364238
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发表时间：
1997
影响因子：
3.2
通讯作者：
S. Mae
中科院分区：
文献类型：
--
作者：
T. Matsuoka;S. Fujita;S. Morishima;S. Mae
在194-262 K温度范围内，用开放式谐振器在39 GHz频率下测量了平行于和垂直于c轴（光轴）的冰Ih的介电常数。冰在微波频率下的介电各向异性对于了解冰雷达和星载微波雷达及辐射计获得的极地遥感数据十分重要。所测量的样品是从阿拉斯加的门登霍尔冰川采集的天然单晶冰。一个非常精确的测量是通过检测两个共振峰实现的，一个来自普通组分，另一个来自非常组分，同时，从一个样品。介电各向异性的真实的部分，Δe′=e c′-e c′，在39 GHz时为0.0339±0.0007（1.07%±0.02%），在252 K时，并略有依赖于温度。还使用平行板电极在1 MHz下进行了参考测量。在微波频率下测得的介电各向异性与1 MHz下的值非常一致。e c′的绝对值。
The dielectric permittivities parallel and perpendicular to the c axis (optic axis) of ice Ih were measured using an open resonator at 39 GHz in the temperature range 194–262 K. The dielectric anisotropy in ice at microwave frequencies is important for understanding remote sensing data in polar regions, obtained by ice radar and satellite-born microwave radar and radiometer. The measured samples were natural single-crystal ice collected from Mendenhall Glacier, Alaska. A very precise measurement was achieved by detecting two resonant peaks, one from the ordinary component and the other from the extraordinary component, simultaneously, from one sample. The real part of dielectric anisotropy, Δe′=e∥c′−e⊥c′, at 39 GHz was 0.0339±0.0007 (1.07%±0.02%) at 252 K and slightly depended on temperature. Reference measurements at 1 MHz using parallel plate electrodes were also carried out. The measured dielectric anisotropy at microwave frequencies agrees very well with the value at 1 MHz. The absolute values of e∥c′...