Coupling Law Between Microwave And Organism And It’s Thermal Effects Application Based On Log

The study of biological effects of electromagnetic will not only provide more scientific basis for the use and protection of the biological effects of electromagnetic radiation, while also providing new ways and means for medical treatment. Existing biological effects of electromagnetic theory is useful in the study of a certain frequency and power electromagnetic effects on biological aspects of feasibility within their respective ranges, but in the electromagnetic radiation and biological role of the internal energy distribution of the organism has been no detailed study. Interference and diffraction phenomenon of electromagnetic led to ununiform radiation energy of various parts of the living body received. Energy distribution of Electromagnetic radiation has a significant impact on biological thermal effects, such as microwave treatment of cancer. Microwave is needed directional coupler to the tumor and normal tissue is required to minimize the absorption of microwave energy. The study of electromagnetic radiation energy distribution in vivo is very significance. In this paper, interaction of the microwave electromagnetic field and two logs (Populus spp. and E.falcata) was taken for example, for major researching coupled Law and thermal effects of electromagnetic waves and organisms.The theoretical basis of the study is described, which include the physical mechanism of substances action, microwave and microwave transmission, waveguide channel and the heating resonator cavity. Based on the theory established, various resonator cavity theoretical model is built. Then finite element analysis for model calculations is introduced. Then studies how the temperature distribution within the timber and microwave energy efficiency effected by the structure and size of the cylindrical cavity, the rectangular cavity, oblique feed rectangular cavity resonator, and the coupling of microwave radiation and log is summarized. Finally, the simulation results of the temperature distribution within the timber get the experimental verification.Important conclusions of this paper are as follows:1.Resonator design. Usually more feed port is beneficial to increase the feed inlet temperature uniformity within the timber, but the specific circumstances of the specific needs analysis; cavity size is related to energy efficiency, for a given size of the timber, there is an optimum cavity size range; in general, the microwave coupling effect of three port cylindrical resonator feeding mode is better than other feed mode, and need to pay attention to match the wavelength and the microwave resonator;2. Experiment findings. The center region is heat up faster than that of three edge area in three port feed mode, which is because the central part is microwave interference strengthened area, the energy concentrate there and the temperature rises rapidly. Under the same feed energy conditions, as the feed power increases, the dry efficiency decrease, So the high power to some extent, will cause a large loss, and it is not conducive for the timber to fully absorb the microwave energy.3. Results of the simulation experiments. The temperature distribution in experiment and simulation is match on the whole, but individual points are quite different. The reason for these differences is likely the change of interior electrical and thermal properties in the log. The correctness of the simulation get experimental verification, the simulation method is useful to the study and design of microwave cavity.