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在白光散斑法测量中,物体表面上的白光散斑场跟随着物体一起运动,所以三维物体表面的变形向量就是白光散斑运动的位移向量。利用向量运算工具,计算变形向量在观察平面上的投影,得到变形向量与记录系统光学参数之间基本关系,即白光散斑运动的投影规律。在坐标平面内,由两个方向观察记录白光散斑图,就可以解三维变形分量,在特殊条件下,该规律可蜕化成最常见的平面变形,离面变形等白光散斑测量。
In the white speckle measurement, the white speckle field on the surface of the object moves along with the object, so the deformation vector of the surface of the three-dimensional object is the displacement vector of white light speckle motion. The vector operator is used to calculate the projection of the deformation vector on the observation plane. The basic relationship between the deformation vector and the optical parameters of the recording system is obtained, that is, the projection rule of white light speckle motion. In the coordinate plane, observing and recording the white light speckle pattern in two directions can solve the three-dimensional deformation component. Under special conditions, the law can degenerate into the most common white plane speckle measurement of plane deformation and out-of-plane deformation.