International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 03 | Mar -2017
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e-ISSN: 2395 -0056 p-ISSN: 2395-0072
SAR experience related to human exposure 1A.Sundar
Raj, 2M. Sandhiya, 3R. Seethaladevi, 4P. Rakshiha 1Associate Professor, 1E.G.S. Pillay Engineering College, Nagapattinam, India 1drasr1982@gmail.com 2,3,4 E.G.S. Pillay Engineering College, Nagapattinam, India
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Abstract: This paper tries to study and analyze the various operating parameters which can influence SAR definition and value. The key parameters that influence SAR include distance, frequency phone angle, Tissue type and Age.
International organizations like IEEE and ICNIRP have set standard for exposure limits in terms of SAR. In IEEE standard [2] the peak SAR as averaged over any 1 g of tissues should not exceed 1.6w/kg while in ICNIRP guide lines [3] the peak SAR as averaged over any 10 g of tissue should not exceed 2w/kg. In the present study is to examine the various parameters which influence SAR.
Keywords: mobile phone, specific Absorption rate SAR, tower, electromagnetic fields. INTRODUCTION The wide spread use of wireless communication device which close the proximity to the human body remains a topic of growing concern to the public. There is a need to evaluate this electromagnetic interaction of wireless device with a human brain in order to establish the safety of the wireless systems. There have been considerable research activities to investigate the biological effects of electromagnetic fields [1].These activities are influenced by factors like the rate of RF energy deposition in biological tissues, called specific absorption rate (SAR) to access the potential health effects. A human body is a homogeneous, loss dielectric whose electrical properties can be influenced when a electric or magnetic field penetrate in to the body, the intensity EM field that penetrate in human body depend on number of internal and external parameters like, frequency, polarization, antenna type & distance, size & shape and dielectric properties of the exposed body size & thickness of RF shield. © 2017, IRJET
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SUBJECT AND METHOD Guidelines and recommended limits on human exposure to radio waves give basic restriction in terms of SAR or power flux density and also reference levels in terms of field strength in absence of the body. SAR is defined as the time derivative of the incremental energy (dW) absorbed by (dissipated in) an incremental mass (dm) contained in a volume element (dV) of given mass density (ρ): And it is expressed in units of watt per kilogram (W/kg). SAR can be calculated also by:
Or
Where Ei is rms value of the electric field strength in the tissue in V/m, σ is conductivity of body tissue in S/m, ρ is density of body tissue in |
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