炸药爆速连续测量的杂波分析及新型探针的研制

针对商用连续电阻丝探针在实际爆速测量过程中易出现间断、跳跃等波形不连续问题,通过理论推导和数值仿真,分析了产生此类杂波的若干原因:外界电磁波干扰、探针中空气冲击波与金属射流干扰。同时结合分析结果,提出了消除各类干扰因素的方法,即通过元件外壳接地和对整个测试电路进行严格的电磁屏蔽;采用压致导通原理代替原先的高温电离导通,改进探针结构和制作工艺,以消除金属射流与降低前驱空气冲击波的影响,最终构建了抗杂波干扰的新型压导探针连续爆速测试系统,测得了较为光滑的爆速曲线,提高了测试数据的准确性。

The mechanism analysis of noise wave in detonation velocity continuous measurement

Some discontinuity problems such as gap and j ump are rather frequent in an actual detonation velocity measurement with commercial continuous resistance wire probe.By theoretical derivation and numerical simulation,the cause of these noise waves are mainly analyzed,including electromagnetic interference from outside,internal air shock wave and metal j et interfer-ence.Besides,some improved methods are put forward in order to eliminate these influences based on the result.The device shell is earthed and the overall test circuit is shielded from electromagnetic wave.Then,using the principle of pressure conduc-tion instead of the original high-temperature ionization,the probe working principle and the production technique are improved, which are able to eliminate metal j et and precursory shock wave.In the end,a new pressure conduction probe for continuous detonation velocity measurement with anti-noise wave is developed,and smooth detonation velocity curve is obtained,which means the test accuracy is improved.