Energy Propagation and Coupling Studies for Line Transducers.
This program is an investigation of the effect of various soil compositions and frost conditions on performance of buried line transducers. The program encompasses theoretical modeling of transfer function of a MILES-type line transducer, controlled experiments in loam, clay and sand soils for vario...
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ftdtic:ADA031741 2023-05-15T16:37:52+02:00 Energy Propagation and Coupling Studies for Line Transducers. Starr,J B HONEYWELL INC HOPKINS MINN GOVERNMENT AND AERONAUTICAL PRODUCTS DIV 1976-08 text/html http://www.dtic.mil/docs/citations/ADA031741 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA031741 en eng http://www.dtic.mil/docs/citations/ADA031741 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Soil Mechanics Snow Ice and Permafrost Seismic Detection and Detectors *SIGNAL PROCESSING *SEISMIC DETECTION *TRANSDUCERS *FROST *PERIMETERS(DEFENSE) *LINEAR ARRAYS *AREA DEFENSE *ANTIINTRUSION DEVICES COUPLING(INTERACTION) PROPAGATION LOADS(FORCES) SECURITY ENERGY SAND CLAY IMPULSE LOADING LOAMS Miles transducers Line transducers Text 1976 ftdtic 2016-02-20T11:40:36Z This program is an investigation of the effect of various soil compositions and frost conditions on performance of buried line transducers. The program encompasses theoretical modeling of transfer function of a MILES-type line transducer, controlled experiments in loam, clay and sand soils for various frost conditions, and correlations between theory and experiment. Experiments were conducted in an indoor test facility where frost conditions could be produced. Response of transducers was measured with vertical cyclic and impulse loads of defined magnitude applied at the soil surface. Experimental data indicates that as long as frost does not penetrate below the burial depth of the transducer, often there is no significant attenuation of line sensitivity; such cases occur when the frozen layer above the transducer does not form a continuous shelf of frozen ground. When a continuous shelf forms, or when frost penetrates below the transducer burial depth, some upward gain adjustment is necessary for satisfactory performance. Several approaches to minimizing performance problems in frozen ground are identified. Lines may be buried as significantly greater depths. Frost penetration may be artificially limited by insulating materials. Adaptive gain control may be introduced based on either frequency domain information or soil temperature measurements. (Author) Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Soil Mechanics Snow Ice and Permafrost Seismic Detection and Detectors *SIGNAL PROCESSING *SEISMIC DETECTION *TRANSDUCERS *FROST *PERIMETERS(DEFENSE) *LINEAR ARRAYS *AREA DEFENSE *ANTIINTRUSION DEVICES COUPLING(INTERACTION) PROPAGATION LOADS(FORCES) SECURITY ENERGY SAND CLAY IMPULSE LOADING LOAMS Miles transducers Line transducers |
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Soil Mechanics Snow Ice and Permafrost Seismic Detection and Detectors *SIGNAL PROCESSING *SEISMIC DETECTION *TRANSDUCERS *FROST *PERIMETERS(DEFENSE) *LINEAR ARRAYS *AREA DEFENSE *ANTIINTRUSION DEVICES COUPLING(INTERACTION) PROPAGATION LOADS(FORCES) SECURITY ENERGY SAND CLAY IMPULSE LOADING LOAMS Miles transducers Line transducers Starr,J B Energy Propagation and Coupling Studies for Line Transducers. |
topic_facet |
Soil Mechanics Snow Ice and Permafrost Seismic Detection and Detectors *SIGNAL PROCESSING *SEISMIC DETECTION *TRANSDUCERS *FROST *PERIMETERS(DEFENSE) *LINEAR ARRAYS *AREA DEFENSE *ANTIINTRUSION DEVICES COUPLING(INTERACTION) PROPAGATION LOADS(FORCES) SECURITY ENERGY SAND CLAY IMPULSE LOADING LOAMS Miles transducers Line transducers |
description |
This program is an investigation of the effect of various soil compositions and frost conditions on performance of buried line transducers. The program encompasses theoretical modeling of transfer function of a MILES-type line transducer, controlled experiments in loam, clay and sand soils for various frost conditions, and correlations between theory and experiment. Experiments were conducted in an indoor test facility where frost conditions could be produced. Response of transducers was measured with vertical cyclic and impulse loads of defined magnitude applied at the soil surface. Experimental data indicates that as long as frost does not penetrate below the burial depth of the transducer, often there is no significant attenuation of line sensitivity; such cases occur when the frozen layer above the transducer does not form a continuous shelf of frozen ground. When a continuous shelf forms, or when frost penetrates below the transducer burial depth, some upward gain adjustment is necessary for satisfactory performance. Several approaches to minimizing performance problems in frozen ground are identified. Lines may be buried as significantly greater depths. Frost penetration may be artificially limited by insulating materials. Adaptive gain control may be introduced based on either frequency domain information or soil temperature measurements. (Author) |
author2 |
HONEYWELL INC HOPKINS MINN GOVERNMENT AND AERONAUTICAL PRODUCTS DIV |
format |
Text |
author |
Starr,J B |
author_facet |
Starr,J B |
author_sort |
Starr,J B |
title |
Energy Propagation and Coupling Studies for Line Transducers. |
title_short |
Energy Propagation and Coupling Studies for Line Transducers. |
title_full |
Energy Propagation and Coupling Studies for Line Transducers. |
title_fullStr |
Energy Propagation and Coupling Studies for Line Transducers. |
title_full_unstemmed |
Energy Propagation and Coupling Studies for Line Transducers. |
title_sort |
energy propagation and coupling studies for line transducers. |
publishDate |
1976 |
url |
http://www.dtic.mil/docs/citations/ADA031741 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA031741 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA031741 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766028162573008896 |