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Fruit and Vegetable Quality Assessment via Dielectric Sensing.

El Khaled D, Novas N, Gazquez JA, Garcia RM, Manzano-Agugliaro F - Sensors (Basel) (2015)

Bottom Line: The demand for improved food quality has been accompanied by a technological boost.A better electrical characterization of the dielectric properties of fruits and vegetables is required for this purpose.It comprehensively and chronologically covers the dielectric experiments explored for fruits and vegetables, along with their appropriate sensing instrumentation, analytical modelling methods and conclusions.

View Article: PubMed Central - PubMed

Affiliation: Departmentof Engineering, University of Almería, 04120 Almería, Spain. dalia.elkhaled@gmail.com.

ABSTRACT
The demand for improved food quality has been accompanied by a technological boost. This fact enhances the possibility of improving the quality of horticultural products, leading towards healthier consumption of fruits and vegetables. A better electrical characterization of the dielectric properties of fruits and vegetables is required for this purpose. Moreover, a focused study of dielectric spectroscopy and advanced dielectric sensing is a highly interesting topic. This review explains the dielectric property basics and classifies the dielectric spectroscopy measurement techniques. It comprehensively and chronologically covers the dielectric experiments explored for fruits and vegetables, along with their appropriate sensing instrumentation, analytical modelling methods and conclusions. An in-depth definition of dielectric spectroscopy and its usefulness in the electric characterization of food materials is presented, along with the various sensor techniques used for dielectric measurements. The collective data are tabulated in a summary of the dielectric findings in horticultural field investigations, which will facilitate more advanced and focused explorations in the future.

No MeSH data available.


The material measurement fixtures.
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sensors-15-15363-f003: The material measurement fixtures.

Mentions: To avoid the disturbances resulting from multiple reflections within the sample and between the sample and antennas, a minimal 10 dB attenuation through the sample layer should be maintained for free space permittivity. For extensive studies, it was advised to use the network analysers and impendence analysers, but, for the common limited cases studies, a suitable sample holder can be constructed in available MW laboratories. For cases where the data are required at only one MW frequency or for a limited number of frequencies, a resonant cavity technique is a logical choice [68]; a resonant cavity can be used to measure other permittivity-related characteristics, such as moisture content, mass volume and mixture proportions [69]. Figure 3 is a graphical presentation of the system measurement suite according to the type of material under test and the frequency range adopted for measurement.


Fruit and Vegetable Quality Assessment via Dielectric Sensing.

El Khaled D, Novas N, Gazquez JA, Garcia RM, Manzano-Agugliaro F - Sensors (Basel) (2015)

The material measurement fixtures.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541835&req=5

sensors-15-15363-f003: The material measurement fixtures.
Mentions: To avoid the disturbances resulting from multiple reflections within the sample and between the sample and antennas, a minimal 10 dB attenuation through the sample layer should be maintained for free space permittivity. For extensive studies, it was advised to use the network analysers and impendence analysers, but, for the common limited cases studies, a suitable sample holder can be constructed in available MW laboratories. For cases where the data are required at only one MW frequency or for a limited number of frequencies, a resonant cavity technique is a logical choice [68]; a resonant cavity can be used to measure other permittivity-related characteristics, such as moisture content, mass volume and mixture proportions [69]. Figure 3 is a graphical presentation of the system measurement suite according to the type of material under test and the frequency range adopted for measurement.

Bottom Line: The demand for improved food quality has been accompanied by a technological boost.A better electrical characterization of the dielectric properties of fruits and vegetables is required for this purpose.It comprehensively and chronologically covers the dielectric experiments explored for fruits and vegetables, along with their appropriate sensing instrumentation, analytical modelling methods and conclusions.

View Article: PubMed Central - PubMed

Affiliation: Departmentof Engineering, University of Almería, 04120 Almería, Spain. dalia.elkhaled@gmail.com.

ABSTRACT
The demand for improved food quality has been accompanied by a technological boost. This fact enhances the possibility of improving the quality of horticultural products, leading towards healthier consumption of fruits and vegetables. A better electrical characterization of the dielectric properties of fruits and vegetables is required for this purpose. Moreover, a focused study of dielectric spectroscopy and advanced dielectric sensing is a highly interesting topic. This review explains the dielectric property basics and classifies the dielectric spectroscopy measurement techniques. It comprehensively and chronologically covers the dielectric experiments explored for fruits and vegetables, along with their appropriate sensing instrumentation, analytical modelling methods and conclusions. An in-depth definition of dielectric spectroscopy and its usefulness in the electric characterization of food materials is presented, along with the various sensor techniques used for dielectric measurements. The collective data are tabulated in a summary of the dielectric findings in horticultural field investigations, which will facilitate more advanced and focused explorations in the future.

No MeSH data available.