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用现有的光纤通信器件,搭建了全光纤光子多普勒速度测量(Photonic Doppler Velocimetry,PDV)系统;用PDV系统测量了激光冲击强化(Laser Shocking Peening,LSP)靶背面自由表面速度。提出了一种称为微分法的新的PDV数据处理方法,并证明了与传统条纹法相比,在相同的硬件条件下,不但提高了测量精度,而且扩大了测量范围。用微分法对LSP实验中的测量数据进行了处理,实现了运动初始阶段自由表面瞬时速度的精确测量,因此微分法对冲击波与轰爆波中瞬态加速过程的数据处理特别适用。
The whole optical fiber Doppler Velocimetry (PDV) system was built with the existing optical fiber communication devices. The free surface velocities at the back of laser shock peening (LSP) were measured by PDV system. A new PDV data processing method called differential method is proposed, and it proves that compared with the traditional fringe method, under the same hardware conditions, it not only improves the measurement accuracy but also enlarges the measuring range. Differential method was used to process the measurement data in LSP experiment to realize the accurate measurement of instantaneous velocity of free surface in the initial stage of motion. Therefore, the differential method is especially suitable for the data processing of shock acceleration and transient acceleration in the detonation wave.