Novel Specific Absorption Rate measurement techniques

This paper presents two specific absorption rate (SAR) measurement techniques, the electro-optic (EO) probe and a SAR estimation method. A prototype of the three-axis EO probe is developed for SAR measurement. The probe is capable of measuring both the amplitude and phase of an electric field (E-field) at multiple frequencies simultaneously. Evaluation results show the potential of applying the three-axis EO probe to practical SAR measurement. In addition, we describe a SAR estimation method that calculates theoretically three dimensional (3-D) SAR distributions from 2-D measurement data to reduce the SAR measurement time. We present the applicability of this method and show that the estimated results are in good agreement with the original 3-D SAR distributions.