Microwave dielectric properties of dry rocks

Ulaby, F. T.; Bengal, T.; Dobson, M.C.; East, J.R.; Garvin, J. B.; Evans, Diane L.

doi:10.1109/36.54359

Cited by 133 publications

(98 citation statements)

References 11 publications

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“…The dielectric constant of geological surfaces is dependent on the chemical composition, the porosity, and the water content of the subsurface layer [18]. For unvegetated, dry surfaces with only a few compositional differences, changes in the dielectric properties are comparatively small, and radar signature characteristics are dominated by surface roughness properties [19].…”

Section: Introductionmentioning

confidence: 99%

Quantitative roughness characterization of geological surfaces and implications for radar signature analysis

Dierking

1999

IEEE Trans. Geosci. Remote Sensing

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Section: Introductionmentioning

confidence: 99%

Quantitative roughness characterization of geological surfaces and implications for radar signature analysis

Dierking

1999

IEEE Trans. Geosci. Remote Sensing

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“…This value of is already considerably lower than the average for all of the silicate classes mentioned above (see Fig. 13 in [22]), although still within the appreciable scatter of the data. Therefore, instead of applying the frequency dependance associated with the much higher values of the quantity measured for the various silicate classes in [22], we will simply use the low-frequency value of as our estimate at the frequency of interest, 16 GHz.…”

Section: Comparison Of Results With Theorymentioning

confidence: 50%

“…13 in [22]), although still within the appreciable scatter of the data. Therefore, instead of applying the frequency dependance associated with the much higher values of the quantity measured for the various silicate classes in [22], we will simply use the low-frequency value of as our estimate at the frequency of interest, 16 GHz. Since, in general, the study found that decreases with frequency, the use of this low-frequency result will lead to a maximum attenuation calculation and a minimum scattering calculation.…”

Section: Comparison Of Results With Theorymentioning

confidence: 72%

“…The variation of the dielectric constant of dry rocks with frequency in the microwave region has been studied [22]. The real part is essentially constant from 1 to 16 GHz.…”

Section: Comparison Of Results With Theorymentioning

confidence: 99%

“…The material in the 8-12 gravel appears to be either a sedimentary, plutonic, or volcanic silicate. The frequency dependance of for each one of these classes is given in [22].…”

Section: Comparison Of Results With Theorymentioning

confidence: 99%

See 2 more Smart Citations

A hybrid experimental/theoretical scattering model for dense random media

Kendra

Sarabandi

1999

IEEE Trans. Geosci. Remote Sensing

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Abstract-The subject of scattering of electromagnetic waves by dense media has been one of intense interest in recent years. The present paper describes polarimetric backscatter measurements made at Ku-band on layers of a dense medium under very carefully controlled circumstances. The experiments have a dual purpose: 1) to evaluate the degree to which the experimental observations are predicted by theoretical, particle-based, random media models and 2) to test a proposed hybrid model by which the scattering and extinction properties of a dense medium are characterized experimentally, allowing future modeling of the polarimetric response for any arbitrary configuration of the medium. The hybrid model assumes that first-order vector radiative transfer (RT) is a suitable theoretical structure, providing that the extinction and phase matrix components are appropriately specified; the specification is accomplished through an inversion algorithm involving polarimetric backscatter measurements. The major conclusions of the study are the following: 1) hybrid model is an adequate description of the dense medium scattering behavior; 2) conventional RT appears to give a reasonable estimate of the observed radar response, but dense medium RT gives a very low estimate; 3) phase function of the effective volume scattering element of the medium, obtained via the hybrid model, suggests a larger effective scatterer than the physical ones.Index Terms-Random media, scattering and propagation, scattering model.

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Determining loss tangent values of dry granite for potential S‐band applications

Helhel

Kocakusak

Sunel

2020

Micro & Optical Tech Letters

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Examination of the historical buildings and the modern buildings for varying applications and specific absorption rate (SAR) reduction for certain applications from security to health concerns find significant attention in both engineering and science. Applications related to an electromagnetic field and material interaction require the determination of the dielectric coefficients of materials. Both ground‐penetrating radar, which is one of the nondestructive examination methods used during the examination of the historical and modern buildings, and SAR techniques manipulating materials' properties for reduction of specific absorption rates use complex dielectric permittivity of materials. The proposed study as a novelty deals with complex dielectric permittivity in the S‐band region for nine different types of granite commonly used in the construction industry. The standard waveguide method is used as a measurement method. The mean εr for granite is measured as 4.49, and the mean tangent loss is measured as 0.45. Correspondingly, unlike the literature, a model that calculates the relative dielectric constant and dielectric loss value is obtained.

show abstract

Microwave dielectric properties of dry rocks

Cited by 133 publications

References 11 publications

Quantitative roughness characterization of geological surfaces and implications for radar signature analysis

Quantitative roughness characterization of geological surfaces and implications for radar signature analysis

A hybrid experimental/theoretical scattering model for dense random media

Determining loss tangent values of dry granite for potential S‐band applications

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