论文部分内容阅读
文章提出了一种利用单缝衍射来测量散射粒子运动速度的新方法,并设计了可行的光学系统和探测装置。该方法利用He-Ne激光器和单只光电探测器并配合简单的光学发射和接收系统实现了对散射粒子一维速度分量的测量。实验结果表明,此方法可以对大区域内的目标散射体进行非接触式主动测速,测速精度可达10-2mm/s。与经典的激光多普勒测速方法相比,它具有测量区域大,目标捕捉容易,测试系统简单,方便调节以及测速范围连续可调等优点。此外,此方法对激光器的频率稳定性、光电探测器的频带宽度和散射粒子尺寸大小的要求都比较低。
In this paper, a new method of measuring the velocity of scattering particles using single-slit diffraction is proposed and a feasible optical system and detector are designed. The method utilizes the He-Ne laser and a single photodetector in combination with a simple optical emission and reception system to measure the one-dimensional velocity component of the scattering particles. The experimental results show that the proposed method can detect the target scatterers in a large area non-contactly, and the precision is up to 10-2mm / s. Compared with the classic laser Doppler velocimetry method, it has the advantages of large measuring area, easy to capture the target, simple test system, convenient adjustment and continuously adjustable speed range. In addition, this method has lower requirements for the frequency stability of the laser, the width of the photodetector and the size of the scattering particles.