Dielectric properties of ice crystals at microwave frequency range

微波频率范围内冰晶的介电特性

• 批准号: 04452084
• 负责人: MAE Shinji
• 金额: $ 3.71万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452084/
• 关键词: Ice; Dielectric constant; Permittivity; Conductivity; Microwave; Acid; Salt; Snow; ICE; DIELECTRIC; PERMITTIVITY; CONDUCTIVITY; MICROWAVE; ACID; ANISOTROPY; 誘電率

The aim of this project is to measure the dielectric constant and dielectric permittivity of single and poly crystals of ice and those which are doped acid (HNO_3, H_2SO_4 and HCl) and salt (NaCl). The range of microwave is from 100MHz to 40GHz. The dielectric measurement of ice under microwave region is so hard that the reliable result has not been reported even though the value of dielectric constant and permittivity is used to be analyzed the signal of satellite-born SAR.and microwave remote sensing in cold and polar regions.The results which we obtained are as follows.(1) anisotropy of dielectric constantThe precise measurement of dielectric constant shows the anisotropy of the constant is 0.327 over the frequency range of the measurement.(2) permittivity and conductivity of doped icePermittivity and conductivity of acid-doped ice at microwave frequency region linearly depend on the concentration of H^+ ion (molar concentration). Those of NaCl-doped ice also depend on the concentration of NaCl.(3) dielectric constant and permittivity of snowBased on the results of (1) and (2), the scattering model of microwave in snow is established and the density and grain size dependence of the dielectric constant and permittivity of snow is explained by the simulation of the model. These results are consistent to the results of the measurements.

本项目的目的是测量冰单晶和多晶以及掺杂酸（HNO_3、H_2SO_4和HCl）和盐（NaCl）的冰单晶和多晶的介电常数和介电常数。微波工作频率范围为100 MHz ~ 40 GHz。微波区冰的介电常数测量是一个困难的问题，即使利用冰的介电常数和介电常数值对星载SAR信号和极地微波遥感信号进行分析，也没有可靠的结果。(1)介电常数的各向异性介电常数的精确测量表明，在测量的频率范围内，常数的各向异性为0.327。(2)掺杂冰的介电常数和电导率在微波频率范围内，酸掺杂冰的介电常数和电导率与H^+离子的浓度（摩尔浓度）呈线性关系。NaCl掺杂的冰的那些也取决于NaCl的浓度。(3)雪的介电常数和介电常数基于（1）和（2）的结果，建立了微波在雪中的散射模型，并通过对模型的仿真，解释了雪的介电常数和介电常数与密度和粒径的关系。这些结果与测量结果一致。

项目成果

S.Fujita and S.Mae: "Propagation of Electromagnetic Waves in ice Derived from Its Dielectric Properties 1.Wave Velocity and Birefringence" Proc.of 1992 Intern.Sympo.on Antennas and Propagation. 3. 869-872 (1992)

S.Fujita 和 S.Mae：“电磁波在冰中的传播源自其介电特性 1.波速和双折射”Proc.of 1992 Intern.Sympo.on Antennas and Propagation。

S.Fujita and S.Mae: "Propagation of Electromagnetic Waves in ice Derived from Its Dielectric Properties 2.Attenuation" Proc.of 1992 Intern.Sympo.on Antennas and Propagation. 3. 873-876 (1992)

S.Fujita 和 S.Mae：“电磁波在冰中的传播源自其介电特性 2.衰减”Proc.of 1992 Intern.Sympo.on Antennas and Propagation。

S.Fujita,T.Matsuoka,S.Morishima and S.Mae: "The measurement on the dielectric properties of ice at HF,VHF and microwave frequencies" 1993 International Geoscience and Remote Sensing Sympo.Sympo.Digest. 3. 1258-1260 (1993)

S.Fujita、T.Matsuoka、S.Morishima 和 S.Mae：“在 HF、VHF 和微波频率下冰的介电特性的测量”1993 年国际地球科学和遥感 Sympo.Sympo.Digest。

S.Fujita and S.Mae: "Causes and natures of ice sheet radio-echo internal reflections estimated from the dielectric properties of ice" Annals of Glaciol.20. 80-86 (1995)

S.Fujita 和 S.Mae：“根据冰的介电特性估计的冰盖无线电回波内反射的原因和性质”《冰川年鉴》20。

S.Fujita and S.Mae: "Propagation of electromagnetic waves in ice derived from its dielectric properties 1.Wave velocity and bire-fringence" Proc.of the International Symp.on Antennas and Propagation. 3. 869-872 (1992)

S.Fujita 和 S.Mae：“电磁波在冰中的传播源自其介电特性 1.波速和双折射”Proc.of the International Symp.on Antennas and Propagation。