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Susceptibility, Permittivity and Dielectric Constant

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Related Experiment Video

Updated: Sep 3, 2025

Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids

Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids

Published on: April 10, 2017

Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz-3 GHz Frequency Range.

Marcin Kafarski¹, Agnieszka Szypłowska¹, Jacek Majcher²

¹Institute of Agrophysics, Polish Academy of Sciences, 20-290 Lublin, Poland.

Materials (Basel, Switzerland)

|July 27, 2022

Summary

Understanding the dielectric properties of rapeseed is crucial for accurate moisture determination and optimizing microwave processing. This study details how dielectric permittivity spectra vary with moisture content, providing key insights for agricultural applications.

Keywords:

dielectric spectroscopy granular materials moisture content radio and microwave measurements rapeseed

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Last Updated: Sep 3, 2025

Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids

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Purification and Reconstitution of TRPV1 for Spectroscopic Analysis

Purification and Reconstitution of TRPV1 for Spectroscopic Analysis

Published on: July 3, 2018

Area of Science:

Agricultural Science
Food Engineering
Electromagnetics

Background:

Rapeseed is a globally significant source of vegetable oil.
Dielectric properties of rapeseed are vital for moisture analysis and microwave processing.
Accurate dielectric data aids in optimizing rapeseed quality control and treatment.

Purpose of the Study:

To investigate the complex dielectric permittivity spectra of rapeseed.
To analyze the impact of moisture content (8.3%–16.1%) on these properties.
To model and understand the dielectric behavior across a wide frequency range.

Main Methods:

Measurements conducted using a vector network analyzer and coaxial transmission-line cell.
Frequency range: 20 MHz to 3 GHz.
Modeling employed a three-pole Debye model and an approximate ABC model.

Main Results:

The real part of dielectric permittivity showed significant dependence on seed water content.
Model parameters derived from Debye and ABC models were highly sensitive to moisture levels.
Analysis revealed clear relationships between model parameters and water content.

Conclusions:

Dielectric permittivity spectra of rapeseed are strongly influenced by moisture content.
Debye and ABC models effectively describe the dielectric behavior of rapeseed.
The findings support improved methods for moisture determination and microwave treatment of rapeseed.