PRECISE MEASUREMENTS OF DIELECTRIC ANISOTROPY IN ICE Ih AT 35GHz USING AN OPEN MICROWAVE RESONATOR

• Main Authors: モリシマ, シゲノリ, フジタ, シュウジ, マツオカ, タケシ, マエ, シンジ, MORISHIMA, Shigenori, FUJITA, Shuji, MATSUOKA, Takeshi, MAE, Shinji
• Language: English
• Published: National Institute of Polar Research 1994
• Subjects: Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/record/3858/files/KJ00000767966.pdf; https://doi.org/10.15094/00003858; https://nipr.repo.nii.ac.jp/records/3858

P(論文) Precise measurement of the dielectric anisotropy in ice Ih at 35GHz was carried out using an open microwave resonator (Fabry-Perot resonator). The purpose of the measurement was to obtain physical parameters necessary for analysis of the polarization state of the electromagnetic waves that propagate through ice masses. The open resonator method was used, because it is suitable for detecting the precise value of dielectric anisotropy, since we can detect both components, permittivity parallel to the c-axis (ε'_<//c>) and permittivity perpendicular to the c-axis (ε'_<⊥c>), at once from a single ice crystal without moving. The result of the measurement at -20℃ was as follows : ε_<//c> is 3.2016±0.0003 and ε'_<⊥c> is 3.1681±0.0003. Thus the dielectric anisotropy (Δε'=ε'_<//c>-ε'_<⊥c>) becomes 0.0335±0.0004. departmental bulletin paper