The UCPH borehole logger
The University of Copenhagen (UCPH) logger measures borehole inclination, azimuth, temperature, diameter and pressure. Readings are made continuously by the logger, and the results are transmitted every 3s to the surface. The tool remembers the maxima and minima of the diameters measured in each 3-s...
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University of Copenhagen
1994
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ftnipr:oai:nipr.repo.nii.ac.jp:00002227 2023-05-15T17:10:59+02:00 The UCPH borehole logger Niels S. Gundestrup Henrik B. Clausen B. Lyle Hansen 1994-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2227 http://id.nii.ac.jp/1291/00002227/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2227&item_no=1&attribute_id=18&file_no=1 en eng University of Copenhagen Snow and Ice Research Group, University of Nebraska https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2227 http://id.nii.ac.jp/1291/00002227/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 224-233(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2227&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2022-11-12T19:43:03Z The University of Copenhagen (UCPH) logger measures borehole inclination, azimuth, temperature, diameter and pressure. Readings are made continuously by the logger, and the results are transmitted every 3s to the surface. The tool remembers the maxima and minima of the diameters measured in each 3-s period. Thus, all extremes in diameter are recorded. The calliper is designed to give a resolution of 0.1mm. A trade-off of this high resolution is that the tool cannot penetrate in a hole inclined more than 15°, and that the hole wall must be reasonably smooth in order to avoid hanging the tool on its callipers. The logger uses a single conductor coaxial steel cable, 3.1mm in diameter. The winch has a standard 3-phase AC motor, which is powered by a variable frequency drive. The weight of the winch, including 3km of cable, is 400kg, and the total power consumption is less than 2kW. This makes it possible to deploy the logger with light aircraft (Twin Otter or helicopter) support. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan |
institution |
Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
The University of Copenhagen (UCPH) logger measures borehole inclination, azimuth, temperature, diameter and pressure. Readings are made continuously by the logger, and the results are transmitted every 3s to the surface. The tool remembers the maxima and minima of the diameters measured in each 3-s period. Thus, all extremes in diameter are recorded. The calliper is designed to give a resolution of 0.1mm. A trade-off of this high resolution is that the tool cannot penetrate in a hole inclined more than 15°, and that the hole wall must be reasonably smooth in order to avoid hanging the tool on its callipers. The logger uses a single conductor coaxial steel cable, 3.1mm in diameter. The winch has a standard 3-phase AC motor, which is powered by a variable frequency drive. The weight of the winch, including 3km of cable, is 400kg, and the total power consumption is less than 2kW. This makes it possible to deploy the logger with light aircraft (Twin Otter or helicopter) support. |
format |
Report |
author |
Niels S. Gundestrup Henrik B. Clausen B. Lyle Hansen |
spellingShingle |
Niels S. Gundestrup Henrik B. Clausen B. Lyle Hansen The UCPH borehole logger |
author_facet |
Niels S. Gundestrup Henrik B. Clausen B. Lyle Hansen |
author_sort |
Niels S. Gundestrup |
title |
The UCPH borehole logger |
title_short |
The UCPH borehole logger |
title_full |
The UCPH borehole logger |
title_fullStr |
The UCPH borehole logger |
title_full_unstemmed |
The UCPH borehole logger |
title_sort |
ucph borehole logger |
publisher |
University of Copenhagen |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2227 http://id.nii.ac.jp/1291/00002227/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2227&item_no=1&attribute_id=18&file_no=1 |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2227 http://id.nii.ac.jp/1291/00002227/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 224-233(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2227&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067801985908736 |