新型贴壁式屏蔽体电磁屏蔽效能检测方法研究

A new test method for electromagnetic shielding effectiveness of underground works

坑道式防护工程为了抗电磁脉冲毁伤，往往在坑道的被覆层上直接贴壁安装薄钢板制成屏蔽体。这种屏蔽体不仅外部无检测空间，而且体积大、形状不规则，这使得现有标准测试方法无法适用。结合工程实际，提出了一种新型测试方法“预埋大环法”，经试验验证可有效表征屏蔽体的屏蔽效能。

To avoid the damage of the electromagnetic pulse, we usually build electromagnetic shield by jointing thin steel boards to the walls inside the underground works. The electromagnetic shielding effectiveness of this type of shield can＇t be measured according to the current standards due to the extremely narrow space outside the shield. In addition, the shield is also large and irregular. In this paper we put forward a new method called ＂setting big ring beforehand ＂to solve this problem. The new method has been proved to be effective in testing the electromagnetic shielding effectiveness.