论文部分内容阅读
高空核爆电磁脉冲(HEMP)对电子和电气设备构成严重威胁,但是目前针对军队急救医疗卫生装备的电磁脉冲(EMP)耦合效应及防护研究还比较薄弱。因此以某款当前军队医院所使用的便携式监护仪为研究对象,利用有界波电磁脉冲模拟器模拟产生HEMP进行辐射试验,评估HEMP对监护仪的辐射效应,在各种试验条件下测量干扰场强阈值,分析HEMP对监护仪的作用机理。试验表明:HEMP辐射场对监护仪的工作状态会造成严重干扰,上升时间短、持续时间短的电磁脉冲对设备的干扰能力更强。结合监护仪结构、辐射试验结果、HEMP对监护仪的作用机理可得出以下结论:①场线耦合是引入电磁脉冲干扰的主要途径,当导联线与入射电场方向平行时耦合效应增强,导联线的屏蔽层结构对屏蔽效能有显著的影响;②监护仪外壳的屏蔽效能较差,电磁脉冲可由显示屏和空隙直接渗透至监护仪内部形成干扰,加强导联线和外壳的屏蔽效能将有效提高监护仪抗HEMP的能力。
High altitude nuclear explosion electromagnetic pulse (HEMP) poses a serious threat to the electrical and electronic equipment. However, the electromagnetic pulse (EMP) coupling effect and protection research on military emergency medical and health equipment is still relatively weak. Therefore, a portable monitor used in a certain current military hospital is taken as a research object, and a bounded wave electromagnetic pulse simulator is used to simulate the radiation test generated by the HEMP to evaluate the radiation effect of the HEMP on the monitor. The interference field is measured under various test conditions Strong threshold, analysis of the mechanism of HEMP on the monitor. Experiments show that: the HEMP radiation field will cause serious interference to the working status of the monitor, the rise time is short, the short duration of the electromagnetic pulse on the device more interference. Combined with the structure of the monitor, the results of the radiation test and the mechanism of action of the HEMP on the monitor, the following conclusions can be drawn: ① Field-line coupling is the main way to introduce electromagnetic pulse interference and the coupling effect is enhanced when the lead line is parallel to the incident electric field The shield structure of the line has a significant impact on the shielding effectiveness; ② shielding shielding poor performance of the monitor, the electromagnetic pulse can be directly penetrated by the monitor and the gap to monitor the internal interference, strengthen the shielding effectiveness of the lead wire and the shell Effectively enhances monitor’s ability to resist HEMP.