爆炸箔起爆器小尺寸飞片速度测试

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0.7 mm0.025 mm和0.5 mm0.025 mm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。

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

An exploding foil initiator was designed. The question of the velocity measurement of small-size 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.