摘要
射频防盗器是基于射频识别(Radio frequency identification,RFID)技术实现对物体的识别跟踪,防盗系统根据所识别到的信息进行合法性判断来实现防盗报警功能。为有效评估13.56 MHz射频防盗器对行人电磁暴露的安全性,本文基于COMSOL Multiphysics软件中RF模块,设计射频防盗器在正常工作状态下辐射行人的电磁环境模型,研究行人通过射频防盗器时的公众电磁暴露问题。分别对射频防盗器天线系统工作在100 mW、1 W时,行人位于防盗器正中央(位置A)和防盗器正中央前侧25 cm(位置B)4种暴露场景进行研究。结果表明:行人位于位置A时,天线馈电功率分别为100 mW和1 W,人体全身组织内部电场强度的最大值分别为0.26 V/m和0.84 V/m,磁场强度的最大值分别为0.05 A/m和0.16 A/m,比吸收率的最大值分别为1.55×10^(-5) W/kg和1.5×10^(-4) W/kg;行人位于位置B时,天线馈电功率分别为100 mW和1 W,人体全身组织内部电场强度最大值分别为0.1 V/m和0.36 V/m,磁场强度最大值分别为2.08×10^(-3) A/m和6.56×10^(-3) A/m,比吸收率的最大值分别为2.29×10^(-6) W/kg和2.92×10^(-5) W/kg。仿真计算结果均低于由国际非电离辐射防护委员会(International Commission on Non-Ionizing Radiation Protection,ICNIRP)制定的公众电磁暴露限值,说明在该射频电磁环境中通过的行人处于公众电磁暴露安全范围内,不会对公众人体健康造成威胁。
Radio frequency anti-theft devices employ radio frequency identification(RFID)technology to identify and track objects.An anti-theft system based on the identification of information legitimacy judgment realizes an anti-theft alarm function.In this study,we effectively evaluated the safety of a 13.56 MHz RF anti-theft device in terms of electromagnetic exposure of pedestrians using the RF module in the COMSOL Multiphysics software.To this end,we designed an electromagnetic environment model to study the public electromagnetic exposure of pedestrians when such an RF anti-theft device is used.In particular,four exposure scenarios were analyzed in which the antenna system of the RF antitheft device was operating at 100 mW and 1 W and a pedestrian was located at the center(location A)and 25 cm away in front of the center(location B)of the anti-theft device.The results showed that when the pedestrian was at location A,for the aforementioned antenna feed power of 100 mW and 1 W,the maximum electric field strength of the whole body tissue was 0.26 V/m and 0.84 V/m,and the maximum magnetic field strength was 0.05 A/m and 0.16 A/m,respectively.The maximum values of the specific absorption rate(SAR)were 1.55×10^(-5) W/kg and 1.5×10^(-4) W/kg,respectively.When the pedestrian was at location B,for the aforementioned antenna feeding power of 100 mW and 1 W,the maximum electric field strength of the whole body tissue was 0.1 V/m and 0.36 V/m,and the maximum magnetic field strength was 2.08×10^(-3) A/m and 6.56×10^(-3) A/m,respectively.In this case,the maximum SAR values were 2.29×10^(-6) W/kg and 2.92×10^(-5) W/kg,respectively.These values obtained from simulation are lower than the public electromagnetic exposure limit established by the International Commission on Non-Ionizing Radiation Protection(ICNIRP).This indicates that pedestrians passing through the RF electromagnetic environment analyzed in this study are within a safe range of public electromagnetic exposure.Therefore,the proposed anti-theft device does not pose a threat to public health.
作者
杨仲懿
逯迈
YANG Zhongyi;LU Mai(Key Laboratory of Optoelectronic Technology and Intelligent Control,Ministry of Education,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
2024年第5期84-96,共13页
Journal of Radiation Research and Radiation Processing
基金
国家自然科学基金(51867014)
甘肃省教育厅项目(2024CXPT-11)资助。
关键词
射频防盗器
天线
公众电磁暴露
射频识别
安全评估
RF anti-theft device
Antennas
Public electromagnetic exposure
Radio frequency identification(RFID)
Security assessment
