We assessed human exposure to radiofrequency (RF) electromagnetic fields used for a wireless communication system installed on a smart meter for communication in the 920 MHz band. In an exposure guideline, the specific absorption rate (SAR) is used as a measure of the thermal effects of human exposure to electromagnetic fields. Although the low‐power wireless communication device used for the smart meter inherently complies with the exposure guideline, the assessment of the RF electromagnetic field exposure is useful to deepen our understanding of human safety. For the exposure assessment, first, a computational smart meter model was constructed and validated by comparison with the measured data of electric fields around an actual smart meter. Using the computational smart meter model, we calculated the SAR in the head of an anatomical human model that was located very close to the smart meter. The maximum SAR in the head was obtained when the antenna was placed in front of a human eye, which was calculated to be 10.3 mW/kg for an input power of 20 mW. It was shown that the maximum SAR was 200 times smaller than the basic restriction level in the exposure guideline.

中文翻译：

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人体暴露于安装在智能电表上的无线通信系统的射频电磁场的数值建模和评估

我们评估了人体暴露于安装在智能电表上以进行920 MHz频段通信的无线通信系统所使用的射频（RF）电磁场。在暴露指南中，比吸收率（SAR）被用作人类暴露于电磁场的热效应的量度。尽管用于智能电表的低功率无线通信设备本质上符合暴露准则，但对射频电磁场暴露的评估有助于加深我们对人身安全的理解。对于暴露评估，首先，通过与实际智能电表周围的电场测量数据进行比较，构建并验证了计算智能电表模型。使用计算智能电表模型，我们在非常接近智能电表的人体解剖模型的头部计算了SAR。将天线放在人眼前面时，可获得头部的最大SAR，对于20 mW的输入功率，计算得出的最大SAR为10.3 mW / kg。结果表明，最大SAR比暴露指导中的基本限制水平小200倍。