LABORATORY DETERMINATION OF ELECTRIC PROPERTIES OF ORNAMENTAL STONES IN GEORADAR HIGH FREQUENCY BAND

A new measurement system of dielectric permittivity and loss tangent of ornamental stones used for example on historical buildings has been developed. Complex permittivity has been measured in the frequency range 1.1 - 1.7 GHz on samples chosen between marbles, sandstones and limestones. The values of dielectric parameters were measured experimentally by placing the sample in a resonant cavity obtained from a waveguide. The research has been developed to define a laboratory testing method in order to improve GPR interpretation by creating a data base of electromagnetic properties of the analysed material

Laboratory determination of electric properties of ornamental stones in georadar high frequency band.

A new measurement system of dielectric permittivity and loss tangent of ornamental stones used for example on historical buildings has been developed. Complex permittivity has been measured in the frequency range 1.1 – 1.7 GHz on samples chosen between marbles, sandstones and limestones. The values of dielectric parameters were measured experimentally by placing the sample in a resonant cavity obtained from a waveguide. The research has been developed to define a laboratory testing method in order to improve GPR interpretation by creating a data base of electromagnetic properties of the analysed materials

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

The use of ground-penetrating radar (GPR) techniques at high frequencies for historical building investigations requires an accurate knowledge of the material complex permittivity. A new measurement system is presented, which by exploiting a resonance phenomenon, yields accurate values of permittivity and resistivity also in the case of low-loss materials. These parameters are obtained from an amplitude-only measurement of the transmission response curve of a rectangular waveguide cavity, loaded by the sample under test. The setup requires the availability of brick-shaped samples, which can be obtained easily in the case of rock materials. Permittivities and resistivities were measured in the frequency range 1.1-1.7 GHz on samples of marbles, sandstones, and limestones. The measurement method and the experimental results are presented and discussed

LABORATORY DETERMINATION OF ELECTRIC PROPERTIES OF ORNAMENTAL STONES IN GEORADAR HIGH FREQUENCY BAND

A new measurement system of dielectric permittivity and loss tangent of ornamental stones used for example on historical buildings has been developed. Complex permittivity has been measured in the frequency range 1.1 – 1.7 GHz on samples chosen between marbles, sandstones and limestones. The values of dielectric parameters were measured experimentally by placing the sample in a resonant cavity obtained from a waveguide. The research has been developed to define a laboratory testing method in order to improve GPR interpretation by creating a data base of electromagnetic properties of the analysed materials

An adaptive cavity setup for accurate measurements of complex dielectric permittivity

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