Measurement system of complex permittivity of ornamental rocks in L frequency band

Vaccaneo, D.; Sambuelli, Luigi; Marini, Paola; Tascone, R.; Orta, Renato

doi:10.1109/tgrs.2004.835225

Cited by 19 publications

(18 citation statements)

References 6 publications

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“…The dominant frequency of the pulse was estimated from spectra of reflections from the pond bottom. Assuming a relative permittivity of the solid mixture equal to 6.5 (Vaccaneo et al, 2004), and using the CRIM formula (Birchak et al, 1974), a porosity of approximately 65% was obtained, that is probably attributable to a silty material. Then, for both 200 and 500 MHz surveys, the average Fourier spectra were calculated for each profile.…”

Section: Data Processingmentioning

confidence: 99%

Mechanisms linking active rock glaciers and impounded surface water formation in high‐mountain areas

Colombo

Sambuelli

Comina

et al. 2017

Earth Surf Processes Landf

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Rock glaciers are slowly flowing mixtures of debris and ice occurring in mountains. They can represent a reservoir of water, and melting ice inside them can affect surface water hydrochemistry. Investigating the interactions between rock glaciers and water bodies is therefore necessary to better understand these mechanisms. With this goal, we elucidate the hydrology and structural setting of a rock glacier–marginal pond system, providing new insights into the mechanisms linking active rock glaciers and impounded surface waters. This was achieved through the integration of waterborne geophysical techniques (ground penetrating radar, electrical resistivity tomography and self‐potentials) and heat tracing. Results of these surveys showed that rock glacier advance has progressively filled the valley depression where the pond is located, creating a dam that could have modified the level of impounded water. A sub‐surface hydrological window connecting the rock glacier to the pond was also detected, where an inflow of cold and mineralised underground waters from the rock glacier was observed. Here, greater water contribution from the rock glacier occurred following intense precipitation events during the ice‐free season, with concomitant increasing electrical conductivity values. The outflowing dynamic of the pond is dominated by a sub‐surface seepage where a minor fault zone in bedrock was found, characterised by altered and highly‐fractured rocks. The applied approach is evaluated here as a suitable technique for investigating logistically‐complex hydrological settings which could be possibly transferred to wider scales of investigation. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Data Processingmentioning

confidence: 99%

Mechanisms linking active rock glaciers and impounded surface water formation in high‐mountain areas

Colombo

Sambuelli

Comina

et al. 2017

Earth Surf Processes Landf

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“…k (x, y) (16) In fact, we can expect the resulting electric field to be dependent on the amplitudes of the exciting modes. Expressions (15) and (16) can now be used in (14), then equating term by term, we can define a set of integral equations, where the unknown quantities are the expanding vector functions M (j) k .…”

Section: Analysis Of a Dielectric Loaded Rectangular Cavitymentioning

confidence: 99%

“…The dielectric properties of the material are then determined from the scattering data using either an analytical or an optimization approach [12][13][14][15][16]. Even in this case, the EM field analysis needed for permittivity determination is performed in terms of a 3-D block, as in the above scenario.…”

Section: Introductionmentioning

confidence: 99%

"Natural" Definition of the Modal Impedances in Non-Homogeneous Dielectric Loaded Rectangular Waveguide

Zappelli¹

2012

PIER B

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Abstract-In this paper, the definition of the modal impedances of the electromagnetic field in a nonhomogeneously filled waveguide is discussed. The presence of TM modal impedances, which are functions of the transverse coordinate, does not permit us to obtain a unique Z matrix of these guides. Hence, the evaluation of the scattering matrix can be involved. The introduction of a "natural" EM expansion overcomes this problem leading to the definition of a unique modal impedance and a unique Z matrix. This approach is applied to the simulation of the effect of a block of dielectric in an empty waveguide by "cascading" the S matrices of the existing junctions. Finally, this "natural" EM expansion is applied to the junction between an empty waveguide and a completely filled waveguide, obtaining an equivalent circuit which better represents the physics of this problem, and to the optical fibers.

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“…Moreover, as it could be expected, the resonance frequency depends essentially on the permittivity r whereas the peak transmission |S 21 | max depends primarily on the resistivity ρ. This fact was discussed in [14] only for c = a. In the extraction procedure, the determination of the pair ( r , ρ) is carried out by a least square optimization technique based on the minimization of the difference between the measured |S 21 | amplitude of the transmission coefficient.…”

Section: Parametric Analysismentioning

confidence: 99%

“…However, a similar system can be employed in the other subbands. A first waveguide setup was described in a previous paper, where a cavity was constructed by means of two rectangular irises in a standard WR650 waveguide [14]. The MUT was placed in the cavity and was supposed to fill completely the cross section.…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Cavity Setup for Accurate Measurements of Complex Dielectric Permittivity

Addamo¹,

Virone²,

Vaccaneo³

et al. 2010

PIER

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Abstract-In order to enhance the accuracy of the complex permittivity data employed in Ground Penetrating Radar (GPR) techniques, an adaptive cavity setup is presented. The use of moveable walls permits to relax the mechanical constraints on the sample dimensions so that it can be employed also in complicate measurement condition as, for example, in the case of wet samples. Moreover, exploiting the cavity resonance phenomenon, low loss materials, such as some type of marbles, can be accurately evaluated. The numerical characterization, the parametric analyses and the L-band measurement results show the validity and the reliability of this configuration.

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Measurement system of complex permittivity of ornamental rocks in L frequency band

Cited by 19 publications

References 6 publications

Mechanisms linking active rock glaciers and impounded surface water formation in high‐mountain areas

Mechanisms linking active rock glaciers and impounded surface water formation in high‐mountain areas

"Natural" Definition of the Modal Impedances in Non-Homogeneous Dielectric Loaded Rectangular Waveguide

An Adaptive Cavity Setup for Accurate Measurements of Complex Dielectric Permittivity

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