【摘要】 该文研究了数字散斑相关方法(DSCM)中由于摄像机与被测物面不垂直而引起的误差。首先从成像原理上进行分析,得出当位移和偏差角度比较小时,误差分别与它们成线性关系。为验证这一结论,提出了引入摄像机成像模型的数字模拟散斑图像生成方法;采用数字散斑相关方法,对模拟散斑图像进行计算,计算的结果与理论分析的误差公式结果非常吻合。基于数字散斑相关测量灵敏度为0.01像素,要求不垂直度或被测平面的平面度应小于5,°这也是二维数字散斑可否用于曲面测量的判据。更多还原

【Abstract】 The errors in the digital speckle correlation method(DSCM) caused by misalignment of the optical camera axis relative to the object plane were analyzed theoretically to show that the errors are linearly related to the displacement and non-perpendicularity when these two items are small.The results were verified using an improved speckle pattern generation simulation with a 3-D camera model.For a DSCM measuring sensitivity of 0.01 pixels,the misalignment from perpendicular of the camera axis or the curvature of the measuring plane must be less than 5°.The method also provides a criterion for curve plane measurement using 2-D DSCM.更多还原