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Attenuation of drill cables
https://nipr.repo.nii.ac.jp/records/2443
https://nipr.repo.nii.ac.jp/records/24434aa5cb4e-b9e2-4d08-b0ee-9c281ffb8c14
名前 / ファイル | ライセンス | アクション |
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KJ00000012995 (234.5 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2002-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Attenuation of drill cables | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Gundestrup, Niels S.
× Gundestrup, Niels S.× Johnsen, Sigfus J. |
|||||
著者所属(英) | ||||||
en | ||||||
University of Copenhagen, Department of Geophysics/University of Copenhagen, Department of Geophysics | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The frequency characteristics of a drill cable determines both the type of communication that can be used between a drill or logger and the surface, as well as the maximum rate of information that can be transferred. In order to revise the design, the attenuation of the cable was measured. The result was far from the characteristics of a coaxial cable. At medium audio frequencies, the attenuation was quite low. However at both low and high frequencies, the attenuation increased significantly, and the high frequency cut off could be approximated by a 3-order low pass filter with a cut off frequency of 8kHz. For comparison, the attenuation of a similar size coaxial type cable will be in order of 1dB/300m at 150kHz increasing to 2dB/300m at 1MHz. If a bandwidth higher than 10kHz is required for a 4km long oceanographic type electromechanical steel armoured cable, this has to be of coaxial construction with a shield separated from the armour. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 56, p. 206-208, 発行日 2002-03 |