桥丝电爆炸过程中的电磁脉冲效应

金属桥丝爆炸实验中,金属桥丝是否完全电起爆对火工品能否正常发火十分重要,为此,提出了一种通过电磁脉冲辐射效应来判断桥丝起爆状态的方法,利用天线探测金属桥丝在起爆中的电磁脉冲信号,并对其进行分析以判断桥丝起爆状态。研究结果表明,完全电起爆和不完全电起爆状态产生的电磁脉冲在持续时间和辐射频谱上存在显著差异。当桥丝完全电起爆时,金属桥丝初始加热阶段的电磁效应和本征爆炸阶段的电磁效应产生的电磁信号持续时间短,等离子体阶段的电磁效应产生的电磁信号持续时间长,电磁脉冲信号中包括90～100 MHz高频电磁辐射;当桥丝没有完全电起爆时,金属桥丝初始加热阶段的电磁效应和本征爆炸阶段的电磁效应产生的电磁信号持续时间长,等离子体阶段的电磁效应产生的电磁信号持续时间短,电磁脉冲信号的频率主要集中在40 MHz以下的低频区域。

Electromagnetic Pulse Effect During the Bridge Wire Electric Explosion

Since it is important to judge the metal bridge wire completely detonated whether or not in the metal bridge wire explosion experiment, a method was proposed to judge the detonation state of the bridge wire by the electromagnetic pulse radiation effect. The electromagnetic pulse signal of the metal bridge wire during the detonation process was measured by the antenna, while the measured electromagnetic pulse signal was analyzed to judge the bridge wire detonation status. The electromagnetic pulse signal shows that the electromagnetic pulse generated by the complete detonation and the incomplete detonation state, has a significant difference in duration and radiation spectrum. When the bridge wire is completely detonated, the electromagnetic signal duration in the intrinsic explosion phase is short, and the electromagnetic signal generated in the plasma phase lasts long. The electromagnetic pulse signal includes high frequency electromagnetic radiation of 90 MHz to 100 MHz. When the bridge wire is not completely detonated, the electromagnetic signal generated during the intrinsic explosion phase lasts for a long time, while the electromagnetic signal generated during the plasma phase has a short duration. The frequency of the electromagnetic pulse signal is mainly concentrated in the low frequency region below 40 MHz.