MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE
In order to detect the thickness of sea ice by UHF radar, it is necessary to know the dielectric constant of the sea ice at numerous stages of ice formation. As the dielectric constant and tan δ of sea ice at UHF range are small, it has been difficult to measure these constants correctly using a sma...
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ftnipr:oai:nipr.repo.nii.ac.jp:00003763 2023-05-15T18:02:11+02:00 MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE タカシマ ハヤオ ヤマコシ ヒサオ マエダ トシオ サクライ アキオ Hayao TAKASHIMA Hisao YAMAKOSHI Toshio MAEDA Akio SAKURAI 1992-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3763 http://id.nii.ac.jp/1291/00003763/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3763&item_no=1&attribute_id=18&file_no=1 en eng ABSTRACT Ship Research Institute National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3763 http://id.nii.ac.jp/1291/00003763/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 6, 160(1992-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3763&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1992 ftnipr 2022-12-10T19:45:50Z In order to detect the thickness of sea ice by UHF radar, it is necessary to know the dielectric constant of the sea ice at numerous stages of ice formation. As the dielectric constant and tan δ of sea ice at UHF range are small, it has been difficult to measure these constants correctly using a small sample of sea ice to compare with the UHF wave length. The authors measured the dielectric constant of model ice by the reflection method using a co-axial device in the frequency range from 200 MHz to 1 GHz. The measurement was done for ice salinity from 1.27 to 9.1‰, and the following results were obtained. 1) The real part of the dielectric constant of model ice increases slightly as the ice salinity increases. The measurement frequency influences the real part so the real part decreases when the frequency is raised. The ice temperature almost does not influence the real part of the dielectric constant. 2) Since the brine volume depends strongly on both salinity and temperature of the model ice, the relation between the imaginary part and the brine volume is expressed by the following : Log (imaginary part)=Const. × (brine volume)^<1/2>. Report Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice National Institute of Polar Research Repository, Japan |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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English |
description |
In order to detect the thickness of sea ice by UHF radar, it is necessary to know the dielectric constant of the sea ice at numerous stages of ice formation. As the dielectric constant and tan δ of sea ice at UHF range are small, it has been difficult to measure these constants correctly using a small sample of sea ice to compare with the UHF wave length. The authors measured the dielectric constant of model ice by the reflection method using a co-axial device in the frequency range from 200 MHz to 1 GHz. The measurement was done for ice salinity from 1.27 to 9.1‰, and the following results were obtained. 1) The real part of the dielectric constant of model ice increases slightly as the ice salinity increases. The measurement frequency influences the real part so the real part decreases when the frequency is raised. The ice temperature almost does not influence the real part of the dielectric constant. 2) Since the brine volume depends strongly on both salinity and temperature of the model ice, the relation between the imaginary part and the brine volume is expressed by the following : Log (imaginary part)=Const. × (brine volume)^<1/2>. |
format |
Report |
author |
タカシマ ハヤオ ヤマコシ ヒサオ マエダ トシオ サクライ アキオ Hayao TAKASHIMA Hisao YAMAKOSHI Toshio MAEDA Akio SAKURAI |
spellingShingle |
タカシマ ハヤオ ヤマコシ ヒサオ マエダ トシオ サクライ アキオ Hayao TAKASHIMA Hisao YAMAKOSHI Toshio MAEDA Akio SAKURAI MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE |
author_facet |
タカシマ ハヤオ ヤマコシ ヒサオ マエダ トシオ サクライ アキオ Hayao TAKASHIMA Hisao YAMAKOSHI Toshio MAEDA Akio SAKURAI |
author_sort |
タカシマ ハヤオ |
title |
MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE |
title_short |
MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE |
title_full |
MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE |
title_fullStr |
MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE |
title_full_unstemmed |
MEASUREMENT OF DIELECTRIC CONSTANT OF MODEL ICE |
title_sort |
measurement of dielectric constant of model ice |
publisher |
ABSTRACT |
publishDate |
1992 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3763 http://id.nii.ac.jp/1291/00003763/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3763&item_no=1&attribute_id=18&file_no=1 |
genre |
Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice |
genre_facet |
Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3763 http://id.nii.ac.jp/1291/00003763/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 6, 160(1992-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3763&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766171942667157504 |