誘電分光法で用いられる電極の解析による皮膚の水和構造の解釈

概要

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Dielectric measurements for human skin were performed by time domain reflectometry (TDR) method with open-ended coaxial probes in vivo in a frequency range from 100MHz up to 15GHz. A relaxation process due to free water was observed in GHz frequency range. We performed dielectric measurements for skin of various parts of a human body by probes with two different outer diameters in order to find basic hydration structure of skin. Larger values of the relaxation strength and the shape parameter and smaller values of the relaxation time were obtained for parts where thickness of epidermis is thinner and also by probes with larger diameters. In addition we also performed dielectric measurement on a double-layer of dielectrics with the upper layer of water and the lower layer of teflon in order to determine a penetration depth of the electric field for four different probes. Using an exponential-like function, we examined to approximate each free water content in epidermis and dermis. Free water content in dermis was larger than that in epidermis. Dielectric measurements for the skin of forefinger soaked in 38℃ water during 35 minutes were performed by three different probes, and a time dependency of the water content was clarified.
東海大学の論文