Precise measurement of dielectric anisotropy in ice Ih at 39 GHz
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 regi...
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craippubl:10.1063/1.364238 2024-02-11T10:03:59+01:00 Precise measurement of dielectric anisotropy in ice Ih at 39 GHz Matsuoka, Takeshi Fujita, Shuji Morishima, Shigenori Mae, Shinji 1997 http://dx.doi.org/10.1063/1.364238 https://pubs.aip.org/aip/jap/article-pdf/81/5/2344/10584173/2344_1_online.pdf en eng AIP Publishing Journal of Applied Physics volume 81, issue 5, page 2344-2348 ISSN 0021-8979 1089-7550 General Physics and Astronomy journal-article 1997 craippubl https://doi.org/10.1063/1.364238 2024-01-26T09:40:36Z 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, Δε′=ε∥c′−ε⊥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 ε∥c′ and ε⊥c′ at 39 GHz were, respectively, smaller than those at 1 MHz and the difference was about 0.044 at 252 K. The results suggest that a small dispersion exists between GHz and MHz frequencies, but there is no frequency dependence in the value of anisotropy. Article in Journal/Newspaper glacier Alaska AIP Publishing Journal of Applied Physics 81 5 2344 2348 |
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General Physics and Astronomy Matsuoka, Takeshi Fujita, Shuji Morishima, Shigenori Mae, Shinji Precise measurement of dielectric anisotropy in ice Ih at 39 GHz |
topic_facet |
General Physics and Astronomy |
description |
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, Δε′=ε∥c′−ε⊥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 ε∥c′ and ε⊥c′ at 39 GHz were, respectively, smaller than those at 1 MHz and the difference was about 0.044 at 252 K. The results suggest that a small dispersion exists between GHz and MHz frequencies, but there is no frequency dependence in the value of anisotropy. |
format |
Article in Journal/Newspaper |
author |
Matsuoka, Takeshi Fujita, Shuji Morishima, Shigenori Mae, Shinji |
author_facet |
Matsuoka, Takeshi Fujita, Shuji Morishima, Shigenori Mae, Shinji |
author_sort |
Matsuoka, Takeshi |
title |
Precise measurement of dielectric anisotropy in ice Ih at 39 GHz |
title_short |
Precise measurement of dielectric anisotropy in ice Ih at 39 GHz |
title_full |
Precise measurement of dielectric anisotropy in ice Ih at 39 GHz |
title_fullStr |
Precise measurement of dielectric anisotropy in ice Ih at 39 GHz |
title_full_unstemmed |
Precise measurement of dielectric anisotropy in ice Ih at 39 GHz |
title_sort |
precise measurement of dielectric anisotropy in ice ih at 39 ghz |
publisher |
AIP Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1063/1.364238 https://pubs.aip.org/aip/jap/article-pdf/81/5/2344/10584173/2344_1_online.pdf |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
Journal of Applied Physics volume 81, issue 5, page 2344-2348 ISSN 0021-8979 1089-7550 |
op_doi |
https://doi.org/10.1063/1.364238 |
container_title |
Journal of Applied Physics |
container_volume |
81 |
container_issue |
5 |
container_start_page |
2344 |
op_container_end_page |
2348 |
_version_ |
1790600398768177152 |