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全光纤光子多普勒速度测量(PDV)系统是一种新型的激光测速系统,可广泛用于冲击波、爆轰波以及其他短时高速运动物体的速度测量。多点测量可以获得靶面不同位置的速度,以测量靶面的形变。为提高测量的空间分辨率,提出使用裸光纤束为PDV系统的探头,并在实验上实现了空间分辨率为375μm的双点速度测量。裸光纤探头的间距较小,一个探头的测量结果可能受到另一个探头反射光的干扰。理论和实验的研究结果表明,当靶面各点速度相同时,测量结果不受干扰光的影响;当各点速度不同时,其测速误差不但与两被测点的速度差有关,还与传感光和干扰光的光强和相位有关。
The all-fiber photonic Doppler velocity measurement (PDV) system is a new laser velocimetry system that is widely used for the velocity measurement of shock waves, detonation waves and other short-time, high-speed moving objects. Multi-point measurement can be obtained at different positions of the target velocity, in order to measure the deformation of the target surface. In order to improve the spatial resolution of the measurement, a probe using bare fiber bundle as a PDV system is proposed, and a dual-point velocity measurement with a spatial resolution of 375 μm is experimentally achieved. Bare fiber probes have a small spacing and the measurement of one probe may be disturbed by the reflected light of another. Theoretical and experimental results show that when the velocity of the target surface is the same, the measurement results are not affected by the interference light. When the velocity of each point is different, the velocity error is not only related to the velocity difference between the two measured points, Sensitivity and interference light intensity and phase.