基于小波变换的爆炸电磁辐射研究  

Research on Electromagnetic Radiation Generated During ExplosionBased on Wavelet Transform

作　　者：朱汪平 栗建桥[1] ZHU Wangping;LI Jianqiao(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《高压物理学报》2023年第5期100-112,共13页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(12172054,11802026)。

摘　　要：常规爆炸伴随着显著的电磁效应,能够对爆炸测试产生干扰,也可以作为一种无接触手段测试爆炸冲击场。研究爆炸电磁效应具有重要的工程应用价值。采用示波器、天线、高速摄像机组成的测量系统对100、200 g药量RDX爆炸电磁辐射进行了5组不同距离测量实验,记录2 ms的电磁辐射信号并对RDX爆炸产生的电磁辐射进行分析。结果表明,RDX爆炸电磁辐射信号主要分为3种时段:重复性强的30μs附近典型特征峰;同组重复性强、不同组重复性一般的30~200μs后续特征峰;200μs后无明显重复性的脉冲信号。结合爆炸高速影像发现,爆炸电磁辐射信号与爆轰产物状态有较强关联,典型特征峰以及后续特征峰主要是爆轰前期剧烈反应使爆轰产物电离产生的信号。利用天线系数反演电场强度曲线,分析药量、距离与电场强度之间的关系,发现对于典型特征峰:同药量下,电场强度随着距离成指数下降;同距离下,200 g药量比100 g药量爆炸产生的电场强度大。Conventional explosions are accompanied by significant electromagnetic effects,which can interfere with explosion testing and also serve as a non-contact means of testing explosion shock waves.The study of explosive electromagnetic effects has important engineering application value.A measurement system composed of an oscilloscope,antennas,and a high-speed camera was used to conduct 5 sets of electromagnetic radiation measurement experiments,whose testing object is 100 or 200 g RDX.The experiment recorded electromagnetic radiation signals with 2 ms,and analyzed the electromagnetic radiation generated by RDX explosion.The experimental results showed that the RDX explosive electromagnetic radiation signal mainly consists of three periods:a typical peak at 30μs with strong repeatability,subsequent peaks with strong repeatability in the same group but poor repeatability in different groups during 30−200μs,and a pulse signal without obvious repeatability after 200μs.Combined with high-speed imaging of the explosion,it’s found that there has been a strong correlation between the explosive electromagnetic radiation and the state of detonation products.The typical peak and subsequent peaks are mainly signals generated by the ionization of the explosive products during the violent reaction in the pre-explosion stage.By using the antenna factor to invert the electric field strength curve,the relationship between the explosive equivalent,distance,and electric field strength was analyzed.It’s found that at the same explosive equivalent,the electric field intensity of typical peak decreases exponentially with distance.At the same distance,the electric field intensity of typical peak generated by a 200 g explosion is greater than that of a 100 g explosion.

关 键 词：黑索金 爆炸电磁信号 时频特性 小波分析 

分 类 号：O383.1[理学—流体力学] O441.5[理学—力学]