ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE.
Travel-time measurements of ultrasonic pulses were carried out in March 1960 on Lake Superior (Keweenaw Bay) near Barage, Mich. The ice was about 45cm thick and consisted of grains with vertical c-axis orientation with the exception of a surface layer of variable thickness. Ultrasonic pulses were tr...
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ftdtic:AD0642110 2023-05-15T16:37:16+02:00 ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. Roethlisberger,Hans COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1966-07 text/html http://www.dtic.mil/docs/citations/AD0642110 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0642110 en eng http://www.dtic.mil/docs/citations/AD0642110 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost (*ICE THICKNESS) (*LAKES ICE) ULTRASONIC RADIATION GREAT LAKES ANISOTROPY TRANSDUCERS Text 1966 ftdtic 2016-02-18T19:37:15Z Travel-time measurements of ultrasonic pulses were carried out in March 1960 on Lake Superior (Keweenaw Bay) near Barage, Mich. The ice was about 45cm thick and consisted of grains with vertical c-axis orientation with the exception of a surface layer of variable thickness. Ultrasonic pulses were transmitted and received by barium titanate cells of cylindrical and spherical shape. The transducers were mounted at the surface and the distance was varied. Several direct and reflected signals could be identified. Of the reflected events, the PS type were the clearest and strongest at distances many times the ice thickness, and thus best suited for ice thickness determination. In order to obtain satisfactory agreement between theoretical and measured travel times the anisotropy of the ice had to be taken into account. The elastic constants determined by Bass et al. (1957) gave reasonable good agreement between computed and measured travel time, but some discrepancies remain to be explained. Part of the observed reflections occurred on cracks in the ice. Using equipment with approximately 100-kc signals the ice thickness was determined by the ultrasonic pulse method, destruction free, with an accuracy of 2-4 cm or 5-10%. For day-to-day comparisons the relative accuracy would be in the order of 0.5 cm. (Author) Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost (*ICE THICKNESS) (*LAKES ICE) ULTRASONIC RADIATION GREAT LAKES ANISOTROPY TRANSDUCERS |
spellingShingle |
Snow Ice and Permafrost (*ICE THICKNESS) (*LAKES ICE) ULTRASONIC RADIATION GREAT LAKES ANISOTROPY TRANSDUCERS Roethlisberger,Hans ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. |
topic_facet |
Snow Ice and Permafrost (*ICE THICKNESS) (*LAKES ICE) ULTRASONIC RADIATION GREAT LAKES ANISOTROPY TRANSDUCERS |
description |
Travel-time measurements of ultrasonic pulses were carried out in March 1960 on Lake Superior (Keweenaw Bay) near Barage, Mich. The ice was about 45cm thick and consisted of grains with vertical c-axis orientation with the exception of a surface layer of variable thickness. Ultrasonic pulses were transmitted and received by barium titanate cells of cylindrical and spherical shape. The transducers were mounted at the surface and the distance was varied. Several direct and reflected signals could be identified. Of the reflected events, the PS type were the clearest and strongest at distances many times the ice thickness, and thus best suited for ice thickness determination. In order to obtain satisfactory agreement between theoretical and measured travel times the anisotropy of the ice had to be taken into account. The elastic constants determined by Bass et al. (1957) gave reasonable good agreement between computed and measured travel time, but some discrepancies remain to be explained. Part of the observed reflections occurred on cracks in the ice. Using equipment with approximately 100-kc signals the ice thickness was determined by the ultrasonic pulse method, destruction free, with an accuracy of 2-4 cm or 5-10%. For day-to-day comparisons the relative accuracy would be in the order of 0.5 cm. (Author) |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
Roethlisberger,Hans |
author_facet |
Roethlisberger,Hans |
author_sort |
Roethlisberger,Hans |
title |
ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. |
title_short |
ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. |
title_full |
ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. |
title_fullStr |
ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. |
title_full_unstemmed |
ULTRASONIC PULSE MEASUREMENTS IN ANISOTROPIC LAKE ICE. |
title_sort |
ultrasonic pulse measurements in anisotropic lake ice. |
publishDate |
1966 |
url |
http://www.dtic.mil/docs/citations/AD0642110 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0642110 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0642110 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027566738571264 |