Millimeter waveband resonator method for absorption cross-section determination of vegetation stalks

Alexey A. Vertiy; Sergiy P. Gavrilov; M. E. Ozel; S. E. Anichenko

doi:10.1117/12.262727

18 December 1996 Millimeter-wave-band resonator method for absorption cross-section determination of vegetation stalks

Alexey A. Vertiy, Sergiy P. Gavrilov, M. E. Ozel, S. E. Anichenko

Proceedings Volume 2842, Millimeter and Submillimeter Waves and Applications III; (1996) https://doi.org/10.1117/12.262727
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

A new millimeter wave resonant method for determination of absorption cross-section of vegetation stalks is given. The method is developed for study of vegetation stalks absorption cross-section as a function of their moisture content, or kR parameter (k is a wave number, R is a stalk radius) in millimeter wavelengths band. Modes E01 of a cylinder resonator are employed for such measurements. Dielectric permittivity and loss tangent of a sample can be found by measuring a frequency shift and Qfactor changes of the resonator. Absorption cross-section of a sample is then calculated using a formula obtained in our theoretical study. This formula can be written analytically as a result of rigorous solution of the related diffraction problem (scattering of a plane electromagnetic wave by cylinder with complex dielectric permittivity if stalk radius is less then 0.5 mm for the wavelength of 8 mm). Results of this investigation may be used in creating electrodynamical models of media containing cylindrical stalks of plants, in direct measurements of some canopy parameters, transmission properties measurements of vegetation canopies etc. Key words: absorption cross-section, measurement, canopy, stalk, resonator, millimeter waves

Citation Download Citation

Alexey A. Vertiy, Sergiy P. Gavrilov, M. E. Ozel, and S. E. Anichenko "Millimeter-wave-band resonator method for absorption cross-section determination of vegetation stalks", Proc. SPIE 2842, Millimeter and Submillimeter Waves and Applications III, (18 December 1996); https://doi.org/10.1117/12.262727

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