基于激光散射的高速微粒测速系统

高速微粒速度测量技术是空间高速粒子地基模拟系统中的一项关键技术。设计并实现了一种利用激光光幕对高速运动微粒的非接触式速度测量系统,分析了测量误差以及进一步提高测量精度的方法。该系统以高功率半导体激光器作为光源,同时采用PIN光电二极管作为光电探测器,利用接收侧向散射光脉冲作为起始和结束信号以测量微粒的平均速度。实验结果表明,该系统可对速度范围为1~10 km/s,直径大于100μm的高速微粒进行测速,精度优于1.8%。

High-Speed Flyer Velocity Measurement System Based on Laser Scattering

High-speed flyer velocity measurement is one of the key technologies in simulating impact of space flyer driven by ground-based system. A non-contact velocity measurement system for high-speed flyer is developed, and the sources of measurement error and the way to improve the measurement accuracy are also analyzed. A high-power laser diode module is used as the light source, and a PIN photodiode is used as the photo-detector. This system utilizes lateral scattering light as the start and the end signal to measure the average velocity of flyers. Experimental results show that this system is adequate to measure the flyers lager than 100 μm, with the velocity varying from 1 km/s to 10 km/s. And its accuracy is higher than 1.8%.