2 results listed
In this paper, the magnetic field exposure analysis of
a human body due to underground power cables is carried out as
the simulation study. Simulations are implemented through a
finite element method (FEM). Human body is modeled as a two
layered cylinder. Upper layer of the cylinder is selected as an
average skin tissue and the inner layer is formed as an average
muscle tissue with realistic values at an extremely low frequency
(ELF) region. Shielding is applied as the mitigation technique and
aluminum (Al) is used as a shielding material. The thickness of 1,
2, 3 and 4 mm shielding materials are applied, respectively.
Evaluations are implemented with respect to the magnetic flux
density and the induced current density. 4 mm shielding which is
the thickest material used simulations shows the best shielding
results to mitigate the magnetic flux density and induced current
density. The worst shielding is obtained for the 1 mm thickness of
the material, as expectedly. Furthermore, as the distance of the
source increases, both magnetic flux density and induced current
density decrease. In other words, these parameters depend on the
distance between a source and observation points. Different
induced current density values of skin and muscle are observed
due to the different electrical properties of tissue. Assessments
have been done according to exposure limits published by the wellknown
organizations.
International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES
K. ATES
H. Feza Carlak
Sukru Ozen
In this study, specific absorption rate (SAR)
simulations of rat model have been carried out by using a finite
integration technique (FIT). Although FIT is similar with finite
difference time domain (FDTD) method in most ways, an integral
form of Maxwell’s equations are used in the FIT method. A
monopole antenna working at 900 MHz has been designed for the
electromagnetic source. Conductivity and permittivity of tissue
have been selected from realistic values and implemented for the
voxel based rat model.
Simulations have been implemented with the 5 W stimulation
power. Aforementioned antenna has been located at 3.5 cm and 5
cm away from the nearest point of the rat model, respectively.
Total SAR values are found as 0.483 W/kg for the 3.5 cm distance
and 0.315 W/kg for the 5 cm distance. Maximum SAR induced at
a head region as it is expected. Furthermore, cross section of the
head and body results indicate that induced SAR vary in different
parts of a body because of electrical properties of each tissue. As
the distance of the antenna increases, the SAR value decreases.
Results show that average SAR value in 1 gr rat tissue is higher
than the value in 10 gr rat tissue.
International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES
K. ATES
H. Feza Carlak
Sukru Ozen