Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air
Abstract Equipment has been designed and tested for ground-based and airborne sounding of temperate glaciers. The transmitter is a free-running pulse generator that uses avalanche-mode transistor breakdown to create high-voltage pulses. The transmit and receive antennas are resistively loaded dipole...
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
1981
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Online Access: | http://dx.doi.org/10.1017/s0022143000011485 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000011485 |
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crcambridgeupr:10.1017/s0022143000011485 2024-06-23T07:54:14+00:00 Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air Watts, Raymond D. Wright, David L. 1981 http://dx.doi.org/10.1017/s0022143000011485 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000011485 en eng Cambridge University Press (CUP) Journal of Glaciology volume 27, issue 97, page 459-469 ISSN 0022-1430 1727-5652 journal-article 1981 crcambridgeupr https://doi.org/10.1017/s0022143000011485 2024-06-12T04:04:47Z Abstract Equipment has been designed and tested for ground-based and airborne sounding of temperate glaciers. The transmitter is a free-running pulse generator that uses avalanche-mode transistor breakdown to create high-voltage pulses. The transmit and receive antennas are resistively loaded dipoles; for the airborne system, a twin-lead transmit element and a three-layer coaxial receive element are used on the inboard end of the respective antennas. The sounders are broadband systems; oscilloscopes are used for receivers. The oscilloscope trace is recorded photographically in the ground-based systems. A sampling oscilloscope is used in the airborne system—the sampling process strobes the waveform to audio frequencies so that it can be recorded on magnetic tape. Echoes have been obtained from ice depths of 550 m using the airborne system and about 1 000 m using the ground-based system. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 27 97 459 469 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Equipment has been designed and tested for ground-based and airborne sounding of temperate glaciers. The transmitter is a free-running pulse generator that uses avalanche-mode transistor breakdown to create high-voltage pulses. The transmit and receive antennas are resistively loaded dipoles; for the airborne system, a twin-lead transmit element and a three-layer coaxial receive element are used on the inboard end of the respective antennas. The sounders are broadband systems; oscilloscopes are used for receivers. The oscilloscope trace is recorded photographically in the ground-based systems. A sampling oscilloscope is used in the airborne system—the sampling process strobes the waveform to audio frequencies so that it can be recorded on magnetic tape. Echoes have been obtained from ice depths of 550 m using the airborne system and about 1 000 m using the ground-based system. |
format |
Article in Journal/Newspaper |
author |
Watts, Raymond D. Wright, David L. |
spellingShingle |
Watts, Raymond D. Wright, David L. Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air |
author_facet |
Watts, Raymond D. Wright, David L. |
author_sort |
Watts, Raymond D. |
title |
Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air |
title_short |
Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air |
title_full |
Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air |
title_fullStr |
Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air |
title_full_unstemmed |
Systems for Measuring Thickness of Temperate and Polar Ice from the Ground or from the Air |
title_sort |
systems for measuring thickness of temperate and polar ice from the ground or from the air |
publisher |
Cambridge University Press (CUP) |
publishDate |
1981 |
url |
http://dx.doi.org/10.1017/s0022143000011485 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000011485 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 27, issue 97, page 459-469 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000011485 |
container_title |
Journal of Glaciology |
container_volume |
27 |
container_issue |
97 |
container_start_page |
459 |
op_container_end_page |
469 |
_version_ |
1802646323861651456 |