An Experimental SAR Estimation of Human Head Exposure to UHF Near Fields Using Dry-Phantom Models and a Thermograph

Toshio NOJIMA; Sadayuki NISHIKI; Takehiko KOBAYASHI

An Experimental SAR Estimation of Human Head Exposure to UHF Near Fields Using Dry-Phantom Models and a Thermograph

Toshio NOJIMA, Sadayuki NISHIKI, Takehiko KOBAYASHI

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An experimental SAR (Specific Absorption Rate) estimation system based upon the thermograph method using a thermograph camera and newly developed homogeneous dry-phantom human models are presented. Experiments are conducted using this system and UHF fields to obtain SAR distributions in the human head irradiated by hand-held portable radios. Experiment results show that the estimated peak SAR's due to the radiation waves from radios of 1W transmitting power are lower than 2W/kg and so conform to the recommendations of the radio-frequency radiation safety guidelines. The developed system enables the surface SAR distributions on the phantom model to be precisely estimated; a function not available with the original system. System parameters required for providing precise estimations are discussed first, and then experiments are conducted to estimate SAR's in the human head exposed to a UHF hand-held portable radio's near field. Finally, estimated data are examined from the viewpoint of radio-frequency exposure safety guidelines.

Publication: IEICE TRANSACTIONS on Communications Vol.E77-B No.6 pp.708-713

Publication Date: 1994/06/25

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Type of Manuscript: Special Section INVITED PAPER (Special Issue on Biological Effects of Electromagnetic Fields)

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Toshio NOJIMA, Sadayuki NISHIKI, Takehiko KOBAYASHI, "An Experimental SAR Estimation of Human Head Exposure to UHF Near Fields Using Dry-Phantom Models and a Thermograph" in IEICE TRANSACTIONS on Communications, vol. E77-B, no. 6, pp. 708-713, June 1994, doi: .
Abstract: An experimental SAR (Specific Absorption Rate) estimation system based upon the thermograph method using a thermograph camera and newly developed homogeneous dry-phantom human models are presented. Experiments are conducted using this system and UHF fields to obtain SAR distributions in the human head irradiated by hand-held portable radios. Experiment results show that the estimated peak SAR's due to the radiation waves from radios of 1W transmitting power are lower than 2W/kg and so conform to the recommendations of the radio-frequency radiation safety guidelines. The developed system enables the surface SAR distributions on the phantom model to be precisely estimated; a function not available with the original system. System parameters required for providing precise estimations are discussed first, and then experiments are conducted to estimate SAR's in the human head exposed to a UHF hand-held portable radio's near field. Finally, estimated data are examined from the viewpoint of radio-frequency exposure safety guidelines.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/e77-b_6_708/_p

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@ARTICLE{e77-b_6_708,
author={Toshio NOJIMA, Sadayuki NISHIKI, Takehiko KOBAYASHI, },
journal={IEICE TRANSACTIONS on Communications},
title={An Experimental SAR Estimation of Human Head Exposure to UHF Near Fields Using Dry-Phantom Models and a Thermograph},
year={1994},
volume={E77-B},
number={6},
pages={708-713},
abstract={An experimental SAR (Specific Absorption Rate) estimation system based upon the thermograph method using a thermograph camera and newly developed homogeneous dry-phantom human models are presented. Experiments are conducted using this system and UHF fields to obtain SAR distributions in the human head irradiated by hand-held portable radios. Experiment results show that the estimated peak SAR's due to the radiation waves from radios of 1W transmitting power are lower than 2W/kg and so conform to the recommendations of the radio-frequency radiation safety guidelines. The developed system enables the surface SAR distributions on the phantom model to be precisely estimated; a function not available with the original system. System parameters required for providing precise estimations are discussed first, and then experiments are conducted to estimate SAR's in the human head exposed to a UHF hand-held portable radio's near field. Finally, estimated data are examined from the viewpoint of radio-frequency exposure safety guidelines.},
keywords={},
doi={},
ISSN={},
month={June},}

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TY - JOUR
TI - An Experimental SAR Estimation of Human Head Exposure to UHF Near Fields Using Dry-Phantom Models and a Thermograph
T2 - IEICE TRANSACTIONS on Communications
SP - 708
EP - 713
AU - Toshio NOJIMA
AU - Sadayuki NISHIKI
AU - Takehiko KOBAYASHI
PY - 1994
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E77-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 1994
AB - An experimental SAR (Specific Absorption Rate) estimation system based upon the thermograph method using a thermograph camera and newly developed homogeneous dry-phantom human models are presented. Experiments are conducted using this system and UHF fields to obtain SAR distributions in the human head irradiated by hand-held portable radios. Experiment results show that the estimated peak SAR's due to the radiation waves from radios of 1W transmitting power are lower than 2W/kg and so conform to the recommendations of the radio-frequency radiation safety guidelines. The developed system enables the surface SAR distributions on the phantom model to be precisely estimated; a function not available with the original system. System parameters required for providing precise estimations are discussed first, and then experiments are conducted to estimate SAR's in the human head exposed to a UHF hand-held portable radio's near field. Finally, estimated data are examined from the viewpoint of radio-frequency exposure safety guidelines.
ER -