Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range
Rapeseed is one of the most important sources of vegetable oil worldwide. Knowledge of the dielectric properties of rapeseed may be beneficial for moisture content determination and the optimization of microwave treatment processes. The aim of this research was to examine the complex dielectric perm...
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MDPI AG
2022-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/14/4844 |
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| author | Marcin Kafarski Agnieszka Szypłowska Jacek Majcher Andrzej Wilczek Arkadiusz Lewandowski Zuzana Hlaváčová Wojciech Skierucha |
| author_facet | Marcin Kafarski Agnieszka Szypłowska Jacek Majcher Andrzej Wilczek Arkadiusz Lewandowski Zuzana Hlaváčová Wojciech Skierucha |
| author_sort | Marcin Kafarski |
| collection | DOAJ |
| description | Rapeseed is one of the most important sources of vegetable oil worldwide. Knowledge of the dielectric properties of rapeseed may be beneficial for moisture content determination and the optimization of microwave treatment processes. The aim of this research was to examine the complex dielectric permittivity spectra of rapeseed of moisture content from 8.3% to 16.1%. The measurements were performed in the 20 MHz–3 GHz frequency range with the use of a vector network analyzer and a coaxial transmission-line cell. The real part of dielectric permittivity significantly depended on the water content of the seeds. The obtained spectra were modeled with the use of a three-pole Debye model with bulk electrical conductivity. Because the highest-frequency pole was found near the high-frequency measurement band limit, the spectra were additionally modeled with the use of an approximate ABC model with two in-band Debye poles. The determined model parameters were found to be highly dependent on the water content of the seeds. The relations between these parameters and water content were analyzed. |
| first_indexed | 2024-03-09T06:18:08Z |
| format | Article |
| id | doaj.art-c699c8be8a344db9b448d208246f0698 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T06:18:08Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-c699c8be8a344db9b448d208246f06982023-12-03T11:50:55ZengMDPI AGMaterials1996-19442022-07-011514484410.3390/ma15144844Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency RangeMarcin Kafarski0Agnieszka Szypłowska1Jacek Majcher2Andrzej Wilczek3Arkadiusz Lewandowski4Zuzana Hlaváčová5Wojciech Skierucha6Institute of Agrophysics, Polish Academy of Sciences, 20-290 Lublin, PolandInstitute of Agrophysics, Polish Academy of Sciences, 20-290 Lublin, PolandDepartment of Electrical Engineering and Electrotechnologies, Lublin University of Technology, 20-618 Lublin, PolandInstitute of Agrophysics, Polish Academy of Sciences, 20-290 Lublin, PolandInstitute of Electronic Systems, Warsaw University of Technology, 00-665 Warsaw, PolandDepartment of Physics, Faculty of Engineering, Slovak University of Agriculture in Nitra, SK-949 76 Nitra, SlovakiaInstitute of Agrophysics, Polish Academy of Sciences, 20-290 Lublin, PolandRapeseed is one of the most important sources of vegetable oil worldwide. Knowledge of the dielectric properties of rapeseed may be beneficial for moisture content determination and the optimization of microwave treatment processes. The aim of this research was to examine the complex dielectric permittivity spectra of rapeseed of moisture content from 8.3% to 16.1%. The measurements were performed in the 20 MHz–3 GHz frequency range with the use of a vector network analyzer and a coaxial transmission-line cell. The real part of dielectric permittivity significantly depended on the water content of the seeds. The obtained spectra were modeled with the use of a three-pole Debye model with bulk electrical conductivity. Because the highest-frequency pole was found near the high-frequency measurement band limit, the spectra were additionally modeled with the use of an approximate ABC model with two in-band Debye poles. The determined model parameters were found to be highly dependent on the water content of the seeds. The relations between these parameters and water content were analyzed.https://www.mdpi.com/1996-1944/15/14/4844granular materialsdielectric spectroscopyradio and microwave measurementsmoisture contentrapeseed |
| spellingShingle | Marcin Kafarski Agnieszka Szypłowska Jacek Majcher Andrzej Wilczek Arkadiusz Lewandowski Zuzana Hlaváčová Wojciech Skierucha Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range Materials granular materials dielectric spectroscopy radio and microwave measurements moisture content rapeseed |
| title | Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range |
| title_full | Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range |
| title_fullStr | Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range |
| title_full_unstemmed | Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range |
| title_short | Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range |
| title_sort | complex dielectric permittivity spectra of rapeseed in the 20 mhz 3 ghz frequency range |
| topic | granular materials dielectric spectroscopy radio and microwave measurements moisture content rapeseed |
| url | https://www.mdpi.com/1996-1944/15/14/4844 |
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