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一種非接觸式微小飛片速度原位測量技術(shù)

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

  • 摘要: 文章提出了一種新的微小飛片平均速度原位測量技術(shù)，并研制了速度測量裝置。在飛片的飛行路徑上設(shè)置片激光，通過測量飛片經(jīng)過片激光的時間間隔及對應的飛行距離，便可獲得飛片的平均速度。測量裝置的主要部件是高頻激光器和高靈敏度光電接收器，無其他復雜或者大型設(shè)備，易于與激光驅(qū)動微小飛片發(fā)射裝置等配套銜接，操作方便，成本低。大量試驗數(shù)據(jù)表明，測量裝置工作穩(wěn)定可靠，對厚度不小于3μm、速度不大于10 km/s的飛片，速度測量精度優(yōu)于5%。

     

    Abstract: Based on the laser beam shut-ofr memod, 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 apparacus, a special miniatIlre laser is employed to produce an optical screen wim thichness of tens of micrometers；the photoelectric accepters wim a response time less than 1 ns are used to record the time signals when a nyer 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 man 5%for a flyer of 3 μm in thickness at a velocity approaching 10 km/s.

     

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