scholarly journals Airborne Ground Penetrating Radar, Field Test

2021 ◽  
Vol 13 (4) ◽  
pp. 667 ◽  
Author(s):  
Dmitry Edemsky ◽  
Alexei Popov ◽  
Igor Prokopovich ◽  
Vladimir Garbatsevich
Keyword(s):  
Ground Penetrating Radar ◽  
Laboratory Experiments ◽  
Cross Coupling ◽  
Measuring System ◽  
Dimensional Model ◽  
Building Site ◽  
Tower Crane ◽  
External Objects ◽  
Resistive Loading ◽  
Ground Penetrating

Deployment of a ground penetrating radar (GPR) on a flying machine allows one to substantially extend the application area of this geophysical method and to simplify carrying out large surveys of dangerous and hard-to-reach terrain, where usual ground-based methods are hardly applied. There is a necessity to promote investigations in this direction by modifying hardware characteristics and developing specific proceeding algorithms. For this purpose, we upgraded commercial ground-based subsurface sounding hardware and performed corresponding computer simulation and real experiments. Finally, the first experimental flights were done with the constructed GPR prototype mounted on a helicopter. Using our experience in the development of ground-based GPR and the results of numerical simulations, an appropriate configuration of antennas and their placing on the flying machine were chosen. Computer modeling allowed us to select an optimal resistive loading of transmitter and receiver dipoles; calculate radiation patterns on fixed frequencies; analyze the efficiency of different conductor diameters in antenna circuit; calculate cross-coupling of transmitting and receiving antennas with the helicopter. Preliminary laboratory experiments to check the efficiency of the designed system were performed on an urban building site, using a tower crane with the horizontal jib to operate the measuring system in the air above the ground area to be sounded. Both signals from the surface and subsurface objects were recorded. To interpret the results, numerical modeling was carried out. A two-dimensional model of our experiment was simulated, it matches well the experimental data. Laboratory experiments provided an opportunity to estimate the level of spurious reflections from the external objects, which helps to recognize weak signals from subsurface objects in GPR surveys under live conditions.

Analysis Method for Studying Groundwater under a Church

2016 ◽  
Vol 861 ◽  
pp. 263-270
Author(s):  
M. Eugenia Torner ◽  
Ángeles Mas ◽  
Carlos Lerma ◽  
Enrique Gil ◽  
Jose Vercher ◽  
...  
Keyword(s):  
Seventeenth Century ◽  
Ground Penetrating Radar ◽  
Research Work ◽  
Three Dimensional ◽  
Analysis Method ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Ground Penetrating ◽  
The Church ◽  
Main Entrance

The Church of Asunción of Llíria (Valencia, Spain) is one of the best examples of the Valencian Baroque of the seventeenth century. This research is based on the study of the building from an urban, historical, and especially, a constructive view. The location of this particular church is unique because it is embedded in a mountain. First, some excavations were made into the mountain before the construction of the church started. Thus, there is a slope between the main entrance of the church and the rear. This research work provides the analysis of the ground humidity throughout the Ground Penetrating Radar (GPR) technique. We have analysed the subsoil of the whole church by various cuts or paths. Longitudinal and transversal measurements allowed us to produce a three-dimensional model of the land on which the church stands. We have also analysed the homogeneity or heterogeneity of the subsoil in each area and the presence of certain ground water routes. The rising moisture has been analysed on the walls and pillars of the church. To this end, a moisture analyser has been employed to monitor the moisture content over a period of six months. With this information, it was possible to identify points that are systematically more humid.

scholarly journals ASSESSING THE CONDITION OF BURIED PIPE USING GROUND PENETRATING RADAR (GPR)

2018 ◽  
Vol XLII-4/W9 ◽  
pp. 77-81
Author(s):  
S. W. Wahab ◽  
D. N. Chapman ◽  
C. D. F. Rogers ◽  
K. Y. Foo ◽  
N. Metje ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
Asset Management ◽  
Laboratory Experiments ◽  
Structural Defects ◽  
Test Facility ◽  
Buried Pipe ◽  
Grid Pattern ◽  
Buried Pipes ◽  
Service Efficiency ◽  
Ground Penetrating

<p><strong>Abstract.</strong> The invention of Ground Penetrating Radar (GPR) technology has facilitated the possibility of detecting buried utilities and has been used primarily in civil engineering for detecting structural defects, such as voids and cavities in road pavements, slabs and bridge decks, but has not been used to assess the condition of buried pipes. Pipe deterioration can be defined as pipes where, for example, cracking, differential deflection, missing bricks, collapses, holes, fractures and corrosion exists. Assessing the deterioration of underground pipes is important for service efficiency and asset management. This paper describes a research project that focused on the use of GPR for assessing the condition of buried pipes. The research involved the construction of a suitable GPR test facility in the laboratory to conduct controlled testing in a dry sand. Plastic pipes were chosen for the experiments. A series of laboratory experiments were conducted to determine the validity and effectiveness of standard commercially available GPR technology in assessing the condition of buried utilities with common types of damage. Several types of damage to the plastic pipe were investigated with respect to different GPR antenna frequencies. The GPR surveys were carried out in order to obtain signal signatures from damaged and undamaged pipes buried at 0.5<span class="thinspace"></span>m depth. These surveys were organised on a grid pattern across the surface of the sand in the test facility. The results presented in this paper show that GPR can identify certain types of damage associated with a buried pipe under these controlled laboratory conditions.</p>

Effects of magnetite on high-frequency ground-penetrating radar

Geophysics ◽  
2013 ◽  
Vol 78 (5) ◽  
pp. H1-H11 ◽  
Author(s):  
Remke L. Van Dam ◽  
Jan M. H. Hendrickx ◽  
Nigel J. Cassidy ◽  
Ryan E. North ◽  
Mine Dogan ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
High Frequency ◽  
Laboratory Experiments ◽  
Parent Material ◽  
Electromagnetic Properties ◽  
Small Scale ◽  
Shallow Subsurface ◽  
Propagation Behavior ◽  
Ground Penetrating ◽  
Reflection Characteristics

Large concentrations of magnetite in sedimentary deposits and soils with igneous parent material have been reported to affect geophysical sensor performance. We have undertaken the first systematic experimental effort to understand the effects of magnetite for ground-penetrating radar (GPR) characterization of the shallow subsurface. Laboratory experiments were conducted to study how homogeneous magnetite-sand mixtures and magnetite concentrated in layers affect the propagation behavior (velocity, attenuation) of high-frequency GPR waves and the reflection characteristics of a buried target. Important observations were that magnetite had a strong effect on signal velocity and reflection, at magnitudes comparable to what has been observed in small-scale laboratory experiments that measured electromagnetic properties of magnetite-silica mixtures. Magnetite also altered signal attenuation and affected the reflection characteristics of buried targets. Our results indicated important implications for several fields, including land mine detection, Martian exploration, engineering, and moisture mapping using satellite remote sensing and radiometers.

scholarly journals High frequency impulse ground penetrating radar application in assessment of interlayer connections

2018 ◽  
Vol 163 ◽  
pp. 02005 ◽  
Author(s):  
Jacek Sudyka ◽  
Lech Krysiński ◽  
Adam Zofka ◽  
Marek Pszczoła ◽  
Piotr Jaskuła
Keyword(s):  
Ground Penetrating Radar ◽  
High Frequency ◽  
Large Scale ◽  
Measuring System ◽  
Electromagnetic Properties ◽  
Electromagnetic Responses ◽  
Pavement Structures ◽  
Zero Offset ◽  
Ground Penetrating ◽  
Frequency Impulse

Ground Penetrating Radar (GPR) technique is commonly used in the nondestructive evaluation of pavement structures. In particular, this method is used to estimate thicknesses of pavement layers as well as it can be utilized in advanced studies of pavement structures. The device presented in this paper comprise the high frequency impulse antennas that allow for investigating the interlayer zones in terms of their electromagnetic properties (e.g. dielectric constant). In some cases these electromagnetic responses can be suitable in the assessment of layer bonding in the pavement structure. This paper discusses the assessment of the quality of asphalt pavement interlayer bonding with the use of high frequency GPR techniques. The preliminary laboratory measurements were performed using an impulse antenna in the zero-offset configuration combined with the large-scale models simulating an idealized horizontal delamination. These measurements allowed to estimate the antenna sensitivity to detect interlayer connection under dry and wet conditions. Analysis of collected results led to formulating practical conclusions regarding critical limitations of the measuring system and adequate methods of signal processing and interpretation. The field investigations consisted of the GPR measurements along selected road sections and collection of the core samples at the locations associated with the specific reflexes. Inspection of the cores provided some real insights into the structure of different delaminations associated with characteristic reflexes. Analysis showed the reflection properties are able to expresses some important features of the interlayer zone, such as delaminations, presence of alien material at the interface, insufficient compaction occurring at the base of layer, and water penetration.

scholarly journals Multiobjective-Optimized Design of a New UWB Antenna for UWB Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
C. Moreno de Jong van Coevorden ◽  
M. Fernández Pantoja ◽  
Salvador G. García ◽  
A. Rubio Bretones ◽  
R. Gómez-Martín ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
Low Cost ◽  
Optimized Design ◽  
Uwb Antenna ◽  
Multiobjective Genetic Algorithm ◽  
High Data ◽  
Resistive Loading ◽  
Uwb Applications ◽  
Ground Penetrating ◽  
Bow Tie

A multiobjective genetic algorithm has been applied to design a new printed, bow-tie antenna for ultrawideband applications, that is, ground penetrating radar, short range and high data rate communications, and so forth. The ultrawideband performance with respect to antenna impedance and gain is achieved by an optimized resistive loading profile and flare angle. A low-cost prototype is manufactured and numerical simulations are validated with measurements.

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