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Speckle-based three-dimensional velocity measurement using spatial filtering velocimetry

机译：使用空间滤波测速技术的基于斑点的三维速度测量

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摘要

We present an optical method for measuring the real-time three-dimensional (3D) translational velocity of a diffusely scattering rigid object observed through an imaging system. The method is based on a combination of the motion of random speckle patterns and regular fringe patterns. The speckle pattern is formed in the observation plane of the imaging system due to reflection from an area of the object illuminated by a coherent light source. The speckle pattern translates in response to in-plane translation of the object, and the presence of an angular offset reference wave coinciding with the speckle pattern in the observation plane gives rise to interference, resulting in a fringe pattern that translates in response to the out-of-plane translation of the object. Numerical calculations are performed to evaluate the dynamic properties of the intensity distribution and the response of realistic spatial filters designed to measure the three components of the object's translational velocity. Furthermore, experimental data are presented that demonstrate full 3D velocity measurement.
机译：我们提出了一种光学方法，用于测量通过成像系统观察到的散射体刚性物体的实时三维（3D）平移速度。该方法基于随机散斑图案和规则条纹图案的运动的组合。由于来自被相干光源照射的物体的区域的反射，在成像系统的观察平面中形成斑点图案。斑点图案响应于对象的平面内平移而平移，并且与观察平面中的斑点图案重合的角度偏移参考波的存在引起干涉，从而导致条纹图案响应于向外平移对象的平面平移。进行数值计算以评估强度分布的动态特性，以及用于测量物体平移速度的三个分量的实际空间滤波器的响应。此外，还提供了演示完整3D速度测量的实验数据。

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