Seasonal Differences in Dielectric Properties of Dwarf Woody Tundra Vegetation in a Microwave Range

Romanov, A. N.; Ulanov, Petr N.

doi:10.1109/tgrs.2018.2881048

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…Moreover, RS applications are widely used for vegetation monitoring and various military purposes. There are several studies on the effects of plant leaves and stems on RS and EM scattering models [4,5]. According to these studies, dielectric parameters in the plant depend largely on the moisture content (MC) of the plant.…”

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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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: 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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“…These measurements are commonly carried out as a function of the moisture content and microwave frequency. Additionally, in the area of biological and organic materials, an extensive activity, for determining dielectric properties, has been published in the literature and, specifically, many studies are about plants [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…Other plants like wheat [ 15 ], two types of conifers [ 16 ], apples [ 17 ], and holly leaves in frozen environments [ 18 ] have also been investigated. Other authors dealt with the issue of seasonal differences in the dielectric properties of dwarf woody tundra vegetation [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…The frequency range is, generally, one of the main aspects regarding dielectric measurements of materials. The different studies mentioned range from an extremely low frequency (<1 kHz) [ 17 ], going by 1–1000 Hz [ 10 ], 1.4 GHz [ 19 ], 2.45 GHz [ 20 ], 3.5 GHz [ 14 , 15 ], 5.5–7.5 GHz [ 21 ], 7.5–8.5 GHz [ 15 ], 1–10 GHz [ 3 ], 300 MHz–11 GHz [ 17 ], 300 MHz–18 GHz [ 12 , 13 ], 0.5–40 GHz [ 18 ], and up to 100 GHz [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Permittivity Measurements for Cypress and Rockrose Biomass Versus Temperature, Density, and Moisture Content

Pérez-Campos

Fayos-Fernández

Guerrero

et al. 2020

Sensors

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Permittivity of materials is of utmost importance for microwave applicators’ design and to predict high-frequency dielectric heating of materials. In the case of aromatic plant biomass, however, there are few data that help researchers design microwave applicators for microwave-assisted extraction. In this work, the permittivity of cypress and rockrose biomass samples were measured versus temperature, density, and moisture content. A resonant technique based on a coaxial bi-reentrant microwave cavity was employed to obtain the complex permittivity of biomass samples as a function of those magnitudes around the 2.45 GHz ISM frequency. The obtained measurements show that large variations for permittivity values can be found with moisture content and density changes for both cypress and rockrose biomass. Temperature also has effects in a lesser degree, although it has an important influence on the cypress biomass loss factor. Polynomial expressions fitting the experimental data were provided in order to facilitate the estimation of intermediate values, which were not explicitly arranged in this work. As a general trend, the permittivity of cypress and rockrose biomass increases with increasing values of moisture content and density, whereas the biomass loss factor increases when temperature rises.

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“…Bitki yaprak ve gövdelerinin UA üzerindeki etkileri ve EM saçılma modelleriyle ilgili çeşitli çalışmalar bulunmaktadır [5][6][7]. UA uygulamaları, bitki örtüsünün izlenmesi ve çeşitli askeri amaçlarda yaygın olarak kullanılmaktadır.…”

Section: Introductionunclassified

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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Seasonal Differences in Dielectric Properties of Dwarf Woody Tundra Vegetation in a Microwave Range

Cited by 11 publications

References 19 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

Permittivity Measurements for Cypress and Rockrose Biomass Versus Temperature, Density, and Moisture Content

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

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