监护仪壳体的EMP屏蔽效能研究

目的:分析不同形状孔缝结构对壳体电磁脉冲屏蔽性能的影响,为金属壳体的医疗设备电磁脉冲防护设计提供参考.方法:以带有不同形状孔缝的监护仪壳体结构为研究对象,通过试验方法,对壳体内部电场和磁场脉冲的幅值-时间参数进行测量.结果:在加载波形为0.1 ms/10 ms的外部电场时,正方形孔耦合的电场最大,圆形孔耦合的最小;在加载波形为2 μs/50μs的外部磁场时,细窄矩形孔耦合的磁场强度最大,圆形孔耦合的最小.结论:通过以上试验可以得出结论,在设计医疗电子设备的金属壳体时,应采用圆形散热孔以减少电磁脉冲的干扰.

EMP Shielding Effectiveness of Monitor Shell

Objective To analyze the electromagnetic pulse（EMP） shielding effectiveness of shell with different apertures so as to provide references for the design of medical equipment＇s shell against the EMP interference.Methods Taking the shells of portable monitor with different apertures as the test objects,the amplitude-time parameters of the electric or magnetic excitation EMP inside the shells were measured.Results When the electrical field pulse with 0.1ms/10ms risetime was used as external excitation,the coupling effect was maximal for square aperture and minimal for round aperture.Moreover when the magnetic field pulse with 2μs /50μs risetime was used as external excitation,the coupling effect was maximal for rectangle aperture and minimal for round aperture.Conclusion It is suggested to use the round apertures as the radiating holes when designing the shell of medical equipment to decrease the inference of EMP.