Microwave Measurements of Dielectric Properties of Corn Vegetation at C-Band and Comparison with Debye- Cole Dual Dispersion Model

Itolikar, Ashish B.; Kurtadikar, M. L.

doi:10.1590/2179-10742017v16i41087

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…M r = m measure − m dry W aC .100 (7) where m measure is the measured weight of the sample. The real part of dielectric constant ( ϵ ′ ) and the imaginary part of dielectric constant ( ϵ ′′ ) should be calculated from the measured S-parameters to understand the effect of MC on the dielectric constant.…”

Section: The Process Of the Dielectric Measurementmentioning

confidence: 99%

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A new semiempirical model determining the dielectric characteristics of citrus leaves for the remote sensing at C band

Genç¹,

Doğan²,

Başyiğit³

2020

Turk J Elec Eng & Comp Sci

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Dielectric parameters (i.e. permittivity) are fundamental to the simulation, design, modeling, and developing of microwave applications. For targeted objects, the complex permittivity is an essential parameter that affects its characteristics of scattering and microwave radiation. Thus, in microwave remote sensing applications, the knowledge of the dielectric property of vegetable materials is used not only to detect planting areas for monitoring and to able to specify the growth stage of them in seasonal variations, but also to determine the water requirement of the plant for controlling (water stress). This paper focuses on determining the dielectric parameters of orange and lemon leaves, grown in the Mediterranean coasts of Turkey, depending on the moisture content (MC) and frequency by measuring the samples (leaves) with waveguide transmission line technique in the larger part of the C band frequency range (4.90-7.05 GHz) (compatible with WR159) in order to propose a novel model based on curve fitting method for estimating the real part of dielectric constant ( ϵ ′ ) and the imaginary part of dielectric constant ( ϵ ′′ ). Using dielectric measurement results of orange leaves, our model based on frequency and MC is compared with the dielectric measurement results of the lemon leaves, which is in the same family with orange species, to specify the accuracy of the proposed model. The determination coefficient, R 2 , and mean square root of errors values are also obtained as 0.966 and 0.824, respectively.

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Section: The Process Of the Dielectric Measurementmentioning

confidence: 99%

“…In addition, the ripening status and quality of the fruit can also be determined by the dielectric measurement of the plant [7,8].…”

Section: Introductionmentioning

confidence: 99%

A new semiempirical model determining the dielectric characteristics of citrus leaves for the remote sensing at C band

Genç¹,

Doğan²,

Başyiğit³

2020

Turk J Elec Eng & Comp Sci

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“…Bitkinin koparılıp belli oranlarda nem miktarından arındırılarak yapılan ölçümlerin yanında, tamamen toz haline getirilip yapılan ölçümlerde mevcuttur. Başta tahıl ürünleri olmak üzere mısır bitkisi üzerinde bazı çalışmalar yapılmıştır [19,20]. Bu sayede, meyvelerin olgunlaşma durumu ve kalitesi belirlenebilir.…”

Section: ′′unclassified

Uzaktan Algılama Sistemleri için Elma ve Armut Yapraklarının Dielektrik Parametrelerinin Ölçülmesi ve Modellenmesi

Genç

2020

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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ÖzGelişen teknolojilerin bitkilerde gerek uzaktan izleme/kontrol gerekse uzaktan algılama (UA) sistemlerinde yaygın bir şekilde kullanılması, bitki kümesinin verim ve kalitenin artmasında önemli rol oynamaktadır. Bitkilerde dielektrik özelliklerin belirlenmesi, bu alanda geliştirilecek sistemler için önem arz etmektedir. Bundan dolayı, bazı bitki türlerinin sıklıkla bulunduğu bölgelerde, elektromanyetik (EM) dalgaların bitki yüzeylerine nüfuz etme açısından dielektrik parametrelerinin çalışılmasını gerektirmektedir. Bu çalışmada Isparta bölgesinde çok yoğun olarak üretilmekte olan elma (Malus communis) ve armut (Pyrus communis) ağaçlarının yapraklarına ait dielektrik parametreler Dalga Kılavuzu İletim Hattı yöntemiyle ölçülmüştür. Ölçümler 3,3-4,9 GHz arasında (WR229 dalga kılavuzu) yapılmış ve nem oranı ve frekansa bağlı elma ve armut yapraklarının dielektrik karakteristikleri incelenmiştir. Elma yapraklarının dielektrik ölçüm verileri kullanarak frekans ve nem oranına (NO) bağlı, eğri uydurma yöntemiyle yeni bir model önerilmiştir. Bu model, elma türüyle aynı aileden olan armut yaprağının dielektrik ölçüm sonuçlarıyla karşılaştırılarak önerilen modelin doğruluğu test edilmiştir. Modelin performansını göstermek için determinasyon katsayısı R 2 ve hataların ortalama karekökü (RMSE) değerleri sırasıyla 0,995 ve 0,625 olarak elde edilmiştir.

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“…The detection of seed water content is realized by constructing a functional relationship among water content, relative permittivity and amplitude ratio. The principle includes Debye-cole model [13][14][15][16][17] which illustrates the relationship between water content and relative permittivity and electromagnetic field theory for establishing the relationship between relative permittivity and amplitude ratio.…”

Section: Principle Of Seed Water Content Detection Systemmentioning

confidence: 99%

“…Therefore, the relative permittivity of the seed ε * can be inverted to obtain the water content of the seed by measuring the amplitude ratio of the two receiving coils according to formula (14).…”

Section: Principle Of Electromagnetic Detectionmentioning

confidence: 99%

Research on the Method of Seed Water Content Measurement Based on Electromagnetic Induction

Lai¹,

Liu²,

Li³

et al. 2018

PIER M

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There exist some problems that the water content of the test object cannot be reflected in real time. The detection time is too long, and the heating measurement method destroys the seed tissue for the traditional measurement of the water content of the seed. In this paper, a structure of single excitation coil to double receiving coils is proposed to measure the water content of the seed via electromagnetic induction. The relative permittivity of the seed can be obtained by the relationship between the amplitude ratio and the water content of the seed. First of all, according to the electromagnetic field theory, the functional relationship between the amplitude ratio of the electromotive force amplitude signals of the two receiving coils and the water content of the seed is established. Secondly, fifty sets of theoretical values of the mentioned model can be obtained through simulation analysis. Finally, comparative tests are carried out by using soybean seeds. The experimental results preliminarily verify the feasibility of the electromagnetic measurement method of the water content of the seed. The advantage of the proposed method is that the measurement of the water content of the seed is non-contacting.

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Microwave Measurements of Dielectric Properties of Corn Vegetation at C-Band and Comparison with Debye- Cole Dual Dispersion Model

Cited by 7 publications

References 4 publications

A new semiempirical model determining the dielectric characteristics of citrus leaves for the remote sensing at C band

A new semiempirical model determining the dielectric characteristics of citrus leaves for the remote sensing at C band

Uzaktan Algılama Sistemleri için Elma ve Armut Yapraklarının Dielektrik Parametrelerinin Ölçülmesi ve Modellenmesi

Research on the Method of Seed Water Content Measurement Based on Electromagnetic Induction

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