基于小波变换的爆炸电磁辐射研究

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 30 μs with strong repeatability, subsequent peaks with strong repeatability in the same group but poor repeatability in different groups during 30−200 μs, and a pulse signal without obvious repeatability after 200 μs. 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.