爆炸箔起爆器小尺寸飞片速度测试

Velocity measurement of the small size flyer of an exploding foil initiator

设计了一套爆炸箔起爆装置,通过精确控制桥箔-飞片-加速腔三者的定位,在飞片表面镀一定厚度的铝膜(铝膜的质量与飞片的质量相比可忽略),合理选择VISAR探头的工作距离和与干涉腔延迟时间相关的条纹常数,屏蔽测试系统以及加设滤光片等,利用VISAR测试技术有效解决了小尺寸飞片速度的测试问题。给出了两种尺寸0.7mm×0.025mm和0.5mm×0.025mm飞片的速度测试结果。结果表明,采取新的措施后,获得了信噪比好、能正确反映爆炸箔起爆器驱动飞片物理过程的信号和飞片速度历史。

An exploding foil initiator was designed. The question of the velocity measurement of smallsize flyer was effectively solved by adopting the measures as follows： （1） accurately control the orientation of bridge foil, flyer and barrel; （2） put a thin aluminum film on the surface of the flyer and the mass of the aluminum film can be neglected compared with that of the flyer; （3） reasonably choose the work distance of the VISAR probe and the fringe constants related with the time delay of interference cavity; （4） shield measuring system and use the optical filter. The velocity measurement results of the flyers with two different sizes of Φ0.7 mm×0. 025mm and Φ0.5 mm×0. 025 mm were given. Compared with the results by Weingart R C, the obtained results after taking the measures above are with good signal-to-noise ratios, and can reflect the physical essence of exploding foil initiator driving flyer.