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微波防护服开口对防护性能影响的计算
Caculation about influence of gap on shield effectiveness of protective suits
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摘要: 在中国人体解剖学模型基础上建立了着装状态连体衣防护服模型,并用时域有限差分法详细考察了0.3～3 GHz微波辐射环境中良导体防护服对人体的防护特点,重点分析了良导体防护服上孔缝电磁泄露的基本规律及其对防护服防护效能的影响.主要得到了以下规律:良导体防护服上孔缝电磁泄露的主要原因为孔缝切断辐射场在防护服上产生的感应电流,当电磁波的电场极化方向与缝隙垂直时,电磁能量更容易发生泄漏;在0.3～3 GHz范围内,防护服的防护效能随着频率的提高而增强;计算结果显示带有孔缝的良导体防护服屏蔽效能难以达到30 dB,对防护效能要求较严格的防护服缝隙需要特殊处理.计算数据以及规律分析为防护服的设计提供了理论支持.Abstract: The protective suits model on human were established on the basis of the perfect electric conductor and the dimensions of a Chinese male.By means of finite-difference time-domain method,the protective characteristics of the protective suits were studied and the influence of the leakage microwave energy caused by the gap on suits were discussed in detail.The calculation results show that the energy leakage is more likely to happen when the electric field vectors are vertical to the gap.It is found that reduction of whole body average specific absorption rate(WBSAR) in cases of vertical incidence and horizontal incidence is significant when wearing protective suits.The shielding effectiveness(SE) of the protective suits increases with the increase of electromagnetic field frequency (from 300 MHz to 3 GHz),and finally becomes stable.Since the gap is inevitable,special treatment need to be performed to avoid the leakage of energy because SE of the protective suits with gap cannot reach 30 dB.
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