Dielectric Spectroscopy

Bánhegyi, György

doi:10.1016/b978-0-7506-9386-8.50013-7

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…Both can be used for material characterization due to their dependence on molecular structure of the material. Complex permittivity of a material relates to a variety of physical phenomena such as ionic conduction, dipole relaxation, atomic polarization and electronic polarization [2]. Complex permittivity is a function of frequency which consists of the real part representing stored energy within the medium and the imaginary part representing loss mechanisms in the material.…”

Section: Introductionmentioning

confidence: 99%

“…The complex relative permittivity of an isotropic material can be written as (1) Where is the permittivity of a material, is the permittivity of the vacuum, is the real relative permittivity and is the total loss of the material. At a certain frequency, we have (2) and are the dipolar and ionic losses, respectively, is the material's conductivity, is the angular frequency [3][4] [5]. In the literature, electromagnetic liquid sensors for water quality monitoring utilize various techniques including ion selective electrodes (ISE) [6][7] [8] and relative permittivity measurement using resonators.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Heavy Metal Contaminated Wastewater Using a Coaxial Sensor and Electromagnetic Wave Reflection Technique

Puangngernmak

Chalermwisutkul

2014

AMM

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Industrial wastewater control is an important issue for protection of the environment. Liquid characterization using radio frequency signal is an interesting approach for selective detection of heavy metal contaminants in industrial wastewater. A simple sensor based on open-ended coaxial structure filled with the liquid under test is proposed. Liquid samples for the experiments are copper, zinc and nickel solutions with various concentrations of 1, 10, 100 and 1000 mg/liter each. From the measurement results using a vector network analyzer (VNA) in combination with the proposed sensor, the concentration of a specific contaminant can be determined by the magnitude of the measured reflection coefficient in a frequency range lower than 2 GHz. Applying a capacitive model of the sensor, complex permittivity of the liquid under test can be calculated from the measured reflection coefficient. Obvious relationship between the imaginary part of complex permittivity and the concentration of contaminant in a frequency range lower than 2 GHz was observed. The type of contaminants in the liquid samples can be identified by the position of the resonant peaks when the magnitude of reflection coefficient is plotted in the spectrum. The frequency range for contaminant’s identification lies between 2 and 3 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Heavy Metal Contaminated Wastewater Using a Coaxial Sensor and Electromagnetic Wave Reflection Technique

Puangngernmak

Chalermwisutkul

2014

AMM

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“…In an industrial chemical process, the purification of biodiesel products is analyzed by the Gas Chromatography (GC) method (modified EN14103) [1][2] which requires costly instruments [3]. The microwave measurement is another technique to characterize properties of material with a complex permittivity value which describes behavior of materials in the terms of stored and dissipated energies [4][5]. A dielectric permittivity spectrum over a wide range of frequency is not constant.…”

Section: Introductionmentioning

confidence: 99%

Transmission Line Based Wideband Microwave Sensor for Determination of Biodiesel Purification

Puangngernmak¹,

Sroykesorn²,

Kangsadan³

et al. 2015

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Abstract. The main objective of this study is the application of the microwave measurement technique to determine electrical characteristics of material with complex permittivity values in a frequency range from 100MHz-10GHz. The measurement results represent the purification level of biodiesel compared to the results analyzed by Gas Chromatography (GC) technique (modified EN14103). The microwave sensor was created based on a simple strip line structure of a microwave transmission line which is filled with the liquid under test (LUT) samples. Scattering parameters have been measured using a vector network analyzer (VNA). After that, the complex permittivity values and impulse response using inverse Fourier transformation of the propagation coefficient have been calculated and compared with the results from GC analysis. The results of complex permittivity can be used to describe the behavior of LUT in terms of relative permittivity related to the stored energy and the dissipation of energy within the sample. The levels of purification of biodiesel are represented by the relative complex permittivity of the LUT. Another way to identify the level of purification uses the complex value of inverse Fourier transformation of the propagation coefficient. By doing this, the stored energy and the dissipation of the LUT can also be analyzed in time domain. Four biodiesel samples have been analyzed using the proposed sensor. The purification level can be obviously identified especially in a frequency range from 2 to 4 GHz.

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Interfacial Moisture Diffusion: Molecular Dynamics Simulation and Experimental Evaluation

Fan

Chan

Yuen

2010

Moisture Sensitivity of Plastic Packages of IC Devices

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Dielectric Spectroscopy

Cited by 3 publications

References 47 publications

Characterization of Heavy Metal Contaminated Wastewater Using a Coaxial Sensor and Electromagnetic Wave Reflection Technique

Characterization of Heavy Metal Contaminated Wastewater Using a Coaxial Sensor and Electromagnetic Wave Reflection Technique

Transmission Line Based Wideband Microwave Sensor for Determination of Biodiesel Purification

Interfacial Moisture Diffusion: Molecular Dynamics Simulation and Experimental Evaluation

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