Design and analysis of wideband antennas for borehole and surface ground penetrating radars: Application to soil moisture content measurements
| Autor: | Florence Sagnard, Michel Froumentin, Fayçal Rejiba |
|---|---|
| Přispěvatelé: | Département Mesure, Auscultation et Calcul Scientifique (LCPC/MACS), Laboratoire Central des Ponts et Chaussées (LCPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Structure et fonctionnement des systèmes hydriques continentaux (SISYPHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Centre d'études techniques de l'équipement Normandie-Centre (CETE Normandie-Centre), Avant création Cerema, Laboratoire Central des Ponts et Chaussées (LCPC), Université Pierre et Marie Curie - Paris 6 (UPMC)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Mines Paris - PSL (École nationale supérieure des mines de Paris) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Frequency band
TENEUR EN EAU Borehole 02 engineering and technology 010502 geochemistry & geophysics DIELECTRIQUE 01 natural sciences law.invention ELECTROMAGNETISME law FORAGE 0202 electrical engineering electronic engineering information engineering MESURE Radar Penetration depth 0105 earth and related environmental sciences Remote sensing SOL business.industry 020206 networking & telecommunications Masonry RADAR Depth sounding Wavelength [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism Ground-penetrating radar business Geology |
| Zdroj: | IEEE International Symposium on Antennas and Propagation IEEE International Symposium on Antennas and Propagation, Jul 2010, Canada. 4p |
| Popis: | In civil engineering, the non destructive sounding of underground infrastructures (embankment, roads, bridges…) allows to monitor the structural integrity or adequacy during construction, and the detection of degradations of construction materials (cement concrete, bituminous concrete, masonry, earthwork…) during the working life [1]. Ground Penetrating Radar (GPR) is a proven technique based on the propagation of transient electromagnetic (EM) waves in a soil or a man-made structure in a large frequency band ([0.1;2] GHz) to detect, localize and characterize dielectric discontinuities with a high resolution. The choice of the frequency range is a trade-off between resolution (close to the wavelength) and penetration depth (around 20 wavelengths). In order to enhance the dielectric characterization of underground structures and particularly to estimate the moisture content of a soil as a function of depth, we have designed several original wideband antennas (folded dipole, blade dipole and bowtie slot) dedicated either to a borehole or a surface GPR radar. As a surface radar relies on wave reflection and a borehole radar on wave transmission [5], the frequency band defined in the case of a surface radar will be lower than in the case of a borehole radar in order to obtain the penetration of EM waves at a depth close to 1 m; in the crosshole radar that considers narrow boreholes with diameter less than 60 mm, the distance between antennas are less than 70 cm. Thus, the frequency bands defined are [0.35;1] GHz and [0.5;1.5] GHz respectively. According to previous studies, the design of the antennas appears as a challenge as we had to reduce the width in the case of the borehole radars (d |
| Databáze: | OpenAIRE |
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