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桥丝式电点火系统电磁安全裕度测量研究

2014-07-09冀军晓

现代电子技术 2014年13期

冀军晓

摘 要: 采用一种半导体带隙型光纤测温仪对电点火系统的电磁安全裕度进行测量。测量桥丝在电磁辐射下温度的变化,根据校准取得桥丝电流和温升的系数,桥丝的感应电流就可计算出来,最终获得电点火系统在电磁辐射下的安全裕度。实验结果表明,该方法能够准确获得复杂电磁环境下感应的桥丝电流,是一种可靠桥丝式电点火系统的电磁安全裕度评估方法。

关键词: 电火工品; 电磁安全裕度; 感应电流; 半导体带隙

中图分类号: TN911.7?34 文献标识码: A 文章编号: 1004?373X(2014)13?0150?03

Research on electromagnetic safety margin measurement of

bridge?wire electric ignition system

JI Jun?xiao

(Luoyang TV University, Luoyang 471000, China)

Abstract: A semiconductor band?gap optic fiber thermodetector is introduced to detect the electromagnetic safety margin of the electric ignition system. The bridge?wire′s temperature change is detected under the direction of electromagnetic radiation. The induced current of bridge?wire can be obtained by calculate the coefficients of bridge?wire′s temperature rise and current. At last the safety margins of electric ignition system are achieved under the direction of electromagnetic radiation. The experimental results show that the method can obtain accurate bridge?wire current induced in complex EM environment, and also is a reliable one to evaluate safety margins of bridge?wire electric ignition system.

Keywords: EED; electromagnetic safety margin; induce current; semiconductor band?gap

0 引 言

电点火系统是武器系统中的关键部件,其在复杂电磁环境下的安全性和可靠性对武器系统作战效能的发挥至关重要。电点火系统主要由电火工品(Electro Explosive Device,EED)构成,电火工品中通常是在两电极之间用贵重金属丝形成一个电桥,即灼热型桥丝式电点火头,处于复杂电磁环境下的桥丝,其内部会感应出射频电流,感应电流会加热桥丝,当达到火药点火温度时,点火头就发火发生爆炸,造成误炸现象,对于武器系统来说会造成严重和可怕的后果。

GJB1389A?2005《系统电磁兼容性要求》[1]中对于电起爆装置,明确规定电磁安全裕度限值为16.5 dB,因此,就需要找到一种准确测量桥丝式电点火系统电磁安全裕度的方法。

电点火系统的电磁安全裕度定义是:最大不发火电流[IMNF]与感应电流[Ii]的比值取对数再乘以20后得到的数值。如何精确测量感应电流是确定电磁安全裕度的关键,通过施加不同量级校准电流给桥丝,得到桥丝上的温升值,经过数据拟合获得桥丝温升与感应电流系数,通过测量桥丝的温度变化就可以获得对应感应电流。……

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