Electric and Magnetic Characterization of Materials

Sandrolini, Leonardo; Reggiani, Ugo; Artioli, M.

doi:10.5772/16282

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…Dielectric permittivity is a complex number ε*(f)=ε′(f)−jε″(f), with real (ε′) and imaginary (ε″) parts that exhibit frequency f dependence. As the relative dielectric permittivity of free water is much higher than the dielectric permittivity of other soil components, soil water content is the main factor influencing the permittivity, especially its real part [6].…”

Section: Introductionmentioning

confidence: 99%

A Seven-Rod Dielectric Sensor for Determination of Soil Moisture in Well-Defined Sample Volumes

Szerement

Woszczyk

Szypłowska

et al. 2019

Sensors

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This paper presents a novel seven-rod sensor used for time-domain reflectometry (TDR) and frequency-domain reflectometry (FDR) measurements of soil water content in a well-defined sample volume. The probe directly measures the complex dielectric permittivity spectrum and for this purpose requires three calibration media: air, water, and ethanol. Firstly, electromagnetic simulations were used to study the influence of the diameter of a container on the sensitivity zone of the probe with respect to the measured calibration media and isopropanol as a verification liquid. Next, the probe was tested in three soils—sandy loam and two silt loams—with six water contents from air-dry to saturation. The conversion from S 11 parameters to complex dielectric permittivity from vector network analyzer (VNA) measurements was obtained using an open-ended liquid procedure. The simulation and measurement results for the real part of the isopropanol dielectric permittivity obtained from four containers with different diameters were in good agreement with literature data up to 200 MHz. The real part of the dielectric permittivity was extracted and related to the moisture of the tested soil samples. Relations between the volumetric water content and the real part of the dielectric permittivity (by FDR) and apparent dielectric permittivity (by TDR) were compared with Topp’s equation. It was concluded that the best fit to Topp’s equation was observed in the case of a sandy loam. Data calculated according to the equation proposed by Malicki, Plagge, and Roth gave results closer to Topp’s calibration. The obtained results indicated that the seven-rod probe can be used to accurately measure of the dielectric permittivity spectrum in a well-defined sample volume of about 8 cm3 in the frequency range from 20 MHz to 200 MHz.

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Section: Introductionmentioning

confidence: 99%

A Seven-Rod Dielectric Sensor for Determination of Soil Moisture in Well-Defined Sample Volumes

Szerement

Woszczyk

Szypłowska

et al. 2019

Sensors

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“…All of them have limitations based on the frequency range, the sample material to be used, the parameters to be obtained etc. In the following a brief overview of the procedures explained in detail in [1], [2] and [3] is given.…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of a Measurement Procedure to obtain the Electric Permittivity and the Magnetic Permeability

Rittner

Fano

2018

Elek.

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Este artículo presenta una implementación del método de línea de transmisión/reflexión para determinar las propiedades electromagnéticas intrínsecas de materiales desconocidos con permeabilidad magnética relativa distinto de uno. Con un analizador vectorial de redes (AVR), los coeficientes de dispersion de la energía transmitida y reflejada se miden simultáneamente para extraer la permitividad eléctrica relativa y la permeabilidad magnética relativa. La tecnica de extracción clásica de Nicolson-Ross-Weir en el dominio de la frecuencia es explicada extensamente y presentada tal que las ecuaciones pueden ser fácilmente implementadas mediante el Software libre GNU OCTAVE. El desfasaje en los planos de referencia y las mediciones de calibración del conector, son realizadas por un AVR de bajo costo sin la funcion de incorporación. Una línea de transmisión coaxil con conectores N hembra es usada por su bajo costo, con el porta muestras de fácil construcción. El procedimiento de medición es válido desde 2 MHz a 6 GHz, mientras que los resultados preliminares se muestran en el rango de 1 a 6 GHz. El artículo también comenta acerca de la preparación de la muestra, especialmente el espesor del material.

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Electric and Magnetic Characterization of Materials

Cited by 2 publications

References 32 publications

A Seven-Rod Dielectric Sensor for Determination of Soil Moisture in Well-Defined Sample Volumes

A Seven-Rod Dielectric Sensor for Determination of Soil Moisture in Well-Defined Sample Volumes

Design and Evaluation of a Measurement Procedure to obtain the Electric Permittivity and the Magnetic Permeability

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