Dielectric spectroscopy of watermelons for quality sensing

Nelson, Stuart O.; Guo, Wenchuan; Trabelsi, Samir; Kays, Stanley J.

doi:10.1088/0957-0233/18/7/014

Cited by 107 publications

(62 citation statements)

References 9 publications

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“…Radio frequency energy penetrates deeper in mangoes compared to microwaves and, thus, is more suited for potential postharvest disinfestation treatment of this fruit (Sosa-Moralesa et al 2009). Measured dielectric properties and sweetness of freshly harvested melons by soluble solids content with an open ended coaxial-line probe and an impedance analyser over the frequency range from 10 MHz to 1.8 GHz at 25°C and reported that correlations were low for both the dielectric constant and the loss factor at most frequencies (Nelson et al , 2007. A new electrical method is proposed for density sorting of spherical fruits, which measures the volume by electric capacity and mass by electronic balance.…”

Section: Fruits and Vegetablesmentioning

confidence: 99%

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

et al. 2011

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Non-destructive systems are recent trends for quality evaluation of fruits and vegetables. Information on post-harvest variations in electrical properties is needed to develop new instruments for this purpose. Electrical properties are finding increasing application in agriculture and food processing industries. Knowledge of dielectric properties of foods as a function of moisture content and temperature is essential in the design and control of drying systems. As simple, rapid and non-destructive measuring techniques, dielectric spectroscopy provides information about the dielectric response of materials to electromagnetic field. Electrical properties of agricultural materials have been of interest for many years. The interest in dielectric properties of materials has historically been associated with the design of electrical equipment. This review paper covers theoretical aspects of different electrical properties, their measurement techniques, applications of dielectric properties in agriculture/food processing sector and potential applications of thermal imaging (TI) for quality and safety assessment in food processing. The values of dielectric properties of a number of products including food grains, fruits and vegetables, and meat and meat products are presented in table form. This comprehensive coverage will be useful for academic, scientific and industrial community in treating and applying the facts in developing/testing new processes and products based on electromagnetic energy application.Keywords Electrical properties . Non-destructive . Measuring techniques . Dielectric constant . Loss factor . Thermal imaging technique . Food quality evaluationThe material investigation and moisture measurement using electromagnetic waves in wide spectrum serve for quality control and improvement in many branches like industry, forest and wood-working industry, civil engineering, agriculture, commerce and also foods e.g. for quality evaluation of meat, fruits, coffee etc (Hlavacova 2003; Venkatesh and Raghavan 2004). Non-destructive evaluation of quality based on constituents of fruits and vegetables has been successfully used (Chen et al. 1999;Jha et al. 2001;Kawano 1998). Electrical characteristics of agricultural materials have been of interest for many years (Nelson 2006) and are utilized in many areas of human activities. Techniques for non-destructive determination of quality and related characteristics of agricultural products are helpful to producers, handlers and processors . Permittivity and moisture can be closely correlated when water content is high. Knowledge of dielectric properties in partially frozen material is critical in determining the rates and uniformity of heating in microwave thawing. Electrical properties are important in processing foods with pulsed electric fields, ohmic heating, induction heating, radio frequency, and microwave heating. These properties are also useful in the detection of processing conditions or the quality of foods (Barbosa-Canovas et al. 2006). Considering ...

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Section: Fruits and Vegetablesmentioning

confidence: 99%

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

et al. 2011

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“…Another Brix sensing technique by measuring electric properties of watermelon are correlated with soluble solid content (Nelson et al, 2007). But these modern technologies are more expensive to be use at small scale cultivations.…”

Section: Introductionmentioning

confidence: 99%

Relationship between total solid content and red, green and blue colour intensity of strawberry (Fragaria x ananassa Duch.) fruits

Abeytilakarathna¹,

Fonseka²,

Eswara

et al. 2013

J Agric Sciences

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“…Presowing treatment of soybean seeds with a pulsed electric field was winter wheat [4], carried out [5][6], onion seeds [7][8], beans and corn [9][10], cotton seeds [11] and etc. In laboratory and field experiments an increase in seed germination to 12 % was obtained; productivity up to 15 % [12; 13].…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of processes in automatic control system

Starodubtseva

Livinsky

Rubtsova

et al. 2018

Engineering for Rural Development

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Abstract. The theoretical analysis of processes in the system "voltage converter -working chamber -layer of seeds" is carried out in the article. The system "voltage converter -working chamber -seed layer" is presented as a continuous link of the automatic control system. The principle of operation of the network voltage converter for the plant for presowing seed treatment by a pulsed electric field is created with the purpose of increasing their seeding qualities and suppressing the pathogenic microflora is presented. One of the components of the proposed device is an alternating current (AC) voltage regulator, used to solve power problems from a rural power grid. The voltage stabilizer is made in autotransformer switching, and the location of the windings is such that the stabilization of the voltage on the load, when changing both the mains voltage and the magnitude of the load, is performed smoothly in the entire range without interrupting the mains and load circuits. Advantages of the stabilizer: a wide range of voltage stabilization; high stability of the voltage on the load; smooth, stepless regulation and stabilization of output voltage; Absence of switching overvoltages and inrush currents. The proposed device differs from existing ones because due to the constant monitoring of energy processes in the layer of processed seeds, and feedback to the control unit, the transformation of the parameters of the pulsed electric field is automatically provided. The automatic transformation of the electric field parameters depending on the changes that have occurred in the seed layer, using the example of seeds with different humidity, is able to maintain the required treatment dose, ensuring stability and repeatability of the results. Synthesis of the structural and circuit diagrams of the voltage converter for presowing seed treatment and its control scheme is performed. The structural scheme of the converter and the principle of its operation are considered.Keywords: automatic control, network voltage converter, pulsed electric field. IntroductionPresowing processing of crops with environmentally friendly methods to improve their sowing qualities is becoming increasingly important due to the growing environmental pollution with pesticides used in agriculture for many decades. This conclusion is confirmed by the studies of a number of scientists, who made presowing treatment with physical factors.Processing of seeds of agricultural crops by a pulsed electric field, as the results of researches show, gives good results in the fight against contamination of seeds with pathogenic mycoflora, increase in germination energy and germination of seeds [1][2][3]. Presowing treatment of soybean seeds with a pulsed electric field was winter wheat [4], carried out [5][6], onion seeds [7][8], beans and corn [9-10], cotton seeds [11] and etc. In laboratory and field experiments an increase in seed germination to 12 % was obtained; productivity up to 15 % [12; 13].Introduction of pulsed electric field (IEP) seed treatment in th...

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Dielectric spectroscopy of watermelons for quality sensing

Cited by 107 publications

References 9 publications

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

Relationship between total solid content and red, green and blue colour intensity of strawberry (Fragaria x ananassa Duch.) fruits

Theoretical analysis of processes in automatic control system

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