Feasibility Study of Helium Mass Spectrometry for Gross-leak Testing of Initiating Explosive Device
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摘要:针对火工品内部为非自由容腔的结构特点，研究在密封性试验中使用氦气法进行火工品大漏检测的可行性。通过分析氦气法检测中细检不能替代粗检的试验原理，进行了不同种类的火工品、热电池及材料的多时段待检时间，以及多次的氦质谱检测试验验证。结果表明：因火工品内部为非自由容腔，氦气通过漏孔扩散进火工品内部后在火工药剂中扩散及容留，负压检测时氦气以较缓慢速率从药剂中释放而非快速散逸，因此用氦气法进行火工品大漏检测具有可行性，可以避免粗检漏带来的外来污染，节省试验时间。
Abstract:According to the non-free volumetric structure of initiating explosive device, the feasibility of using helium mass spectrum leak testing to detect the gross-leak of the initiating explosive device in the leakproofness test was explored. Through the analysis of the mechanism that the fine-leak detection cannot replace the gross-leak detection in the helium mass spectrum leak testing, the multi-period waiting time and multiple helium mass spectrometry testing verification for different kinds of initiating explosive device, thermal battery and materials were carried out. The results show that, because it is a non-free volume inside the initiating explosive device, helium gas diffuses into the explosive powders through a gross leak hole and then diffuses and holds in them. When testing under the negative pressure, the helium gas releases again from the explosive powders at a relatively slower rate rather than dissipation rapidly. Therefore, it is feasible to use the helium mass spectrum leak test method to detect the gross-leak of the initiating explosive device, so as to avoid the external pollution caused by the gross-leak test and save the test time.
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