A Stochastic Analysis of Cross-Hole Ground-Penetrating Radar Zero-Offset Profiles for Subsurface Characterization

2012 ◽  
Vol 11 (4) ◽  
pp. vzj2011.0078 ◽  
Author(s):  
Matteo Rossi ◽  
Giorgio Cassiani ◽  
Andrew Binley
Keyword(s):  
Ground Penetrating Radar ◽  
Stochastic Analysis ◽  
Subsurface Characterization ◽  
Zero Offset ◽  
Ground Penetrating

scholarly journals Ground‐penetrating radar: Analysis of point diffractors for modeling and inversion

Geophysics ◽  
2001 ◽  
Vol 66 (2) ◽  
pp. 540-550 ◽  
Author(s):  
Albane C. Saintenoy ◽  
Albert Tarantola
Keyword(s):  
Ground Penetrating Radar ◽  
Electromagnetic Properties ◽  
Radiation Patterns ◽  
Property Variation ◽  
Diagnostic Interpretation ◽  
Reflection Data ◽  
The Earth ◽  
Zero Offset ◽  
Ground Penetrating ◽  
And Inversion

The three electromagnetic properties appearing in Maxwell’s equations are dielectric permittivity, electrical conductivity and magnetic permeability. The study of point diffractors in a homogeneous, isotropic, linear medium suggests the use of logarithms to describe the variations of electromagnetic properties in the earth. A small anomaly in electrical properties (permittivity and conductivity) responds to an incident electromagnetic field as an electric dipole, whereas a small anomaly in the magnetic property responds as a magnetic dipole. Neither property variation can be neglected without justification. Considering radiation patterns of the different diffracting points, diagnostic interpretation of electric and magnetic variations is theoretically feasible but is not an easy task using ground‐penetrating radar. However, using an effective electromagnetic impedance and an effective electromagnetic velocity to describe a medium, the radiation patterns of a small anomaly behave completely differently with source‐receiver offset. Zero‐offset reflection data give a direct image of impedance variations while large‐offset reflection data contain information on velocity variations.

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.

Sign in / Sign up

Export Citation Format

Share Document