2015

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

Gelişen teknolojilerin bitkilerde gerek uzaktan izleme/kontrol gerekse uzaktan algılama (UA) sistemlerinde yaygınbir şekilde kullanılması, bitki kümesinin verim ve kalitenin artmasında önemli rol oynamaktadır. Bitkilerdedielektrik özelliklerin belirlenmesi, bu alanda geliştirilecek sistemler için önem arz etmektedir. Bundan dolayı,bazı bitki türlerinin sıklıkla bulunduğu bölgelerde, elektromanyetik (EM) dalgaların bitki yüzeylerine nüfuz etmeaçısından dielektrik parametrelerinin çalışılmasını gerektirmektedir. Bu çalışmada Isparta bölgesinde çok yoğunolarak üretilmekte olan elma (Malus communis) ve armut (Pyrus communis) ağaçlarının yapraklarına ait dielektrikparametreler Dalga Kılavuzu İletim Hattı yöntemiyle ölçülmüştür. Ölçümler 3,3-4,9 GHz arasında (WR229 dalgakılavuzu) yapılmış ve nem oranı ve frekansa bağlı elma ve armut yapraklarının dielektrik karakteristikleriincelenmiştir. Elma yapraklarının dielektrik ölçüm verileri kullanarak frekans ve nem oranına (NO) bağlı, eğriuydurma yöntemiyle yeni bir model önerilmiştir. Bu model, elma türüyle aynı aileden olan armut yaprağınındielektrik ölçüm sonuçlarıyla karşılaştırılarak önerilen modelin doğruluğu test edilmiştir. Modelin performansınıgöstermek için determinasyon katsayısı R2 ve hataların ortalama karekökü (RMSE) değerleri sırasıyla 0,995 ve0,625 olarak elde edilmiştir.

Measurement and Modeling of Dielectric Parameters of Apple and Pear Leaves for Remote Sensing Systems

The widespread use of developing technologies in both remote monitoring/control and remote sensing (RS) systems in vegetative materials plays an important role in increasing the efficiency and quality of the plants. Determination of dielectric properties in plants is important for the systems to be progressed in this field. Therefore, it is necessary to study dielectric parameters in order to penetrate plant surfaces of electromagnetic (EM) waves in areas where some plant species are frequently found. In this study, dielectric characteristics of the leaves of apple and pear trees which are produced in Isparta region are measured with Waveguide Transmission Line method. Measurements are made between 3.3-4.9 GHz (WR229 waveguide) and dielectric characteristics of apple and pear leaves depending on moisture content (MC) and frequency are investigated. A new model is proposed via a curve fitting method based on the frequency and moisture content using dielectric measurement data of apple leaves. The accuracy of the proposed model is tested by comparing the model results with the dielectric measurement results of the pear which belong to the same family with the apple species. To make sure the performance of the model well enough, the coefficient of determination R 2 and root mean square error (RMSE) values are obtained as 0.995 and 0.625, respectively.

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