用于瞬态高速飞片速度测量的光子多普勒测速系统

Photonic Doppler velocimetry used for instant velocity measurement of high-speed small flyer

针对目前VISAR等测速仪在测量瞬态高速小飞片速度时调试复杂、测试成功率低等问题,基于光子多普勒效应和自混频原理,采用1 550 nm单模激光,成功研制了一套光子多普勒测速系统。使用该系统测量了不同激光能量密度下的复合飞片瞬时速度,结果显示：该系统测试成功率高,响应速度快,获得的速度曲线完整而清晰。与传统的VISAR和F-P干涉测速仪相比,具有操作简单、测试成功率高、便于携带等非常明显的优势。该系统适用于速度在几百米/s~几千米/s的微小飞片或者微区爆轰的速度测量,也可应用于常规爆炸流场的测试。

Based Doppler shifted effect and self-mixing effect, an all-fiber photonic Doppler velocimetry was developed to solve the problem when VISAR was used to measure high-acceleration flyers, the Doppler-shifted signals often lost. Used this system to measure the laser-driven flyer＇s velocity at different energies. The results showed that the PDV system have a high measuring success rate, high react speed, and the calculated results is good. Compared with VISAR and F-P interference velocimetries, the PDV have many advantages such as operation more simple, high measuring success rate, easy for carrying. This system was suitable to measure the velocities of small flyers and small scale detonation which had speeds between hundreds and thousands meters per second, also the usual detonation speed measurement.