Animal Skin Temperature, Millimeter-wave Irradiation

The Electromagnetics has a widely application in the industry, agriculture, medicine, military and everyday life. The life science has also step by step come into the cell and biomacromolecule level, such as protein, nucleic acid and polysaccharide, especially the gene level. With the widely using of electromagnetic field (waves) day and day and rapid development of life science and technology, the comprehension that electromagnetic waves influence life process is more and more deep. The bioelectromagnetics—a new knowledge emerges correspondingly. Electromagnetic field (waves) has a convenient side, but also can take harms to the human being and other organisms. It is always a hot spot of research of bioelectromagnetics discovering the mechanism of electromagnetic bioeffect, finding and using the electromagnetic bioeffect propitious to growth and reproduction of organisms and treating disease, avoiding the aspect harmful to health. In this thesis, the progress of electromagnetic bioeffect research is reviewed. The novel works , researching the effect of millimeter waves radiation to the temperature of animal skin, both theoretical and experimental, are carried. In this research, a new mmw radiating system is designed and built up, and near 1W/cm2 irradiation power density is obtained. In order to increase the irradiation power density of local view point, the low loss Teflon microwave lens focusing energy of microwave is used near the irradiating horn. As the Teflon is opaque, it is impossible measuring the focal spot size and focal length with optical method. By infrared thermal imaging techniques in this thesis, the focal spot size and focal length of this dielectric lens antenna are measured. We have not found the same method reported in relevant papers and it is novel. The effect of mmw inducing temperature rise of rat skin is investigated and the data of temperature variety of skin surface corresponding to the variety of irradiation time and power density is acquired. With the experiment result, we can arrive a conclusion that when the mmw power density is hundreds mW/cm2, the surface temperature of rat skin is direct proportional to the irradiation time and irradiation intensity within certain time range and beyond a certain time range, the surface temperature of rat skin will tend to be stabilized.According to the bio-heat equation and the transmitting characteristics of mmw...