一种非接触式微小飞片速度原位测量技术

文章提出了一种新的微小飞片平均速度原位测量技术，并研制了速度测量装置。在飞片的飞行路径上设置片激光，通过测量飞片经过片激光的时间间隔及对应的飞行距离，便可获得飞片的平均速度。测量装置的主要部件是高频激光器和高灵敏度光电接收器，无其他复杂或者大型设备，易于与激光驱动微小飞片发射装置等配套衔接，操作方便，成本低。大量试验数据表明，测量装置工作稳定可靠，对厚度不小于3μm、速度不大于10 km/s的飞片，速度测量精度优于5%。

A new kind of Velocity in-situ measuring technique for laser-driven flyer system

Based on the laser beam shut-off method, a new kind of velocity in-situ measuring technique is presented, with which a non-contact velocity measuring apparatus is built. The velocity of a flyer is calculated by measuring the time interval in-situ while it flies through the laser screens for a certain distance. For the apparatus, a special miniature laser is employed to produce an optical screen with thichness of tens of micrometers; the photoelectric accepters with a response time less than 1 ns are used to record the time signals when a flyer is launched and arrived. This non-contact velocity measuring apparatus is very simple in components, with high sensitivity and is relatively inexpensive. The experimental data show that the measurement error is less than 5% for a flyer of 3 μm in thickness at a velocity approaching 10 km/s.