SAR and Thermal Model in detailed evaluation human eye model exposed to electromagnetic wave

Abstract

This paper investigates the effect of frequency, polarization of an incident plane electromagnetic wave on the specific absorption rate (SAR) and heating distributions in human eyes at four testing frequency of 900MHz, 1800MHz, 1900MHz and 2450MHz. The research of SAR and maximum temperature increment in the human eye under electromagnetic wave exposure are presented in this paper. A Japanese male head model has been adopted in this research. The influence of frequency, polarizations of a plane electromagnetic wave on the SAR in both left and right eyes and lens are investigated by finite-difference time-domain (FDTD) numerical technique with discretization of 2 mm cell size. Also, SAR averaging schemes in Institute of Electrical and Electronics Engineers (IEEE) and The International Commission on Non-Ionizing Radiation Protection (ICNIRP) are taken into account. Starting from the calculated SAR values, the heating distributions has been derived through the bio-heat equation. For the result of the computation, the hotspot locations depend on the frequency and the polarization. It also shows that the local SAR in the lens of the eye is relatively smaller than that in other tissues. Finally, it is worth noting that a direct relationship between SAR and temperature increase.