[Problems of using a thermocouple for measurements of skin
temperature rise during the exposure to millimeter waves].
[Article in Russian]
Alekseev SI, Ziskin MS, Fesenko EE.
Biofizika. 2011 May-Jun;56(3):561-5. Russian.
PMID:
21786711
[PubMed - indexed for MEDLINE]
Abstract
The possibility of using thermocouples for the artifact-free measurements of skin temperature during millimeter
wave exposure was studied. The distributions of the specific absorption rate (SAR) in the human skin were
calculated for different orientations of the thermocouple relative to the E-field of exposure. It was shown that, at
the parallel orientation of a thermocouple relative to the E-field, SAR significantly increased at the tip of the
thermocouple. This can result in an overheating of the thermocouple. At the perpendicular orientation of a
thermocouple, the distortions of the SAR were insignificant. The data obtained confirm that the skin temperature
can be measured with a thermocouple during exposure under the condition that the thermocouple is located
perpendicular to the E-vector of the electromagnetic field. For the accurate determination of SAR from the rate of
the initial temperature rise, it is necessary to fit the temperature kinetics measured with the thermocouple to the
solution of the bio-heat transfer equation.
http://www.ncbi.nlm.nih.gov/pubmed/21786711
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