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在对快速甚至高速运动物体进行研究时,需要对运动物体各个时刻的三维面形和形变量进行数字化描述。提出了一种利用频闪光作为结构照明光源,基于傅里叶变换轮廓术对旋转叶片每个时刻的三维面形和变形量进行动态测量的光学方法。使用自行设计的同步控制单元对风扇叶片旋转位置进行检测,用该检测信号同步驱动频闪结构光源的发光和图像采集系统“冻结”记录下旋转叶片表面变形条纹的瞬时图像,再运用傅里叶变换轮廓术计算出每一瞬间时刻旋转叶片的三维面形,分析这些三维面形数字化结果可以进一步得到旋转叶片的变形量。通过对家用电风扇的实验,验证了该方法的合理性和可行性。该方法可望在高速运动物体的面形和变形研究上有广泛运用。
In the study of fast and even high-speed moving objects, it is necessary to digitally describe the three-dimensional shape and amount of deformation of moving objects at each moment. An optical method of using stroboscopic light source as structure illumination source and dynamic measurement of three-dimensional surface and deformation of rotating blade at every moment based on Fourier transform profilometry was proposed. The self-designed synchronous control unit is used to detect the rotational position of the fan blades. The detection signal synchronously drives the light emission of the strobe structure light source and the image acquisition system “freeze” records the instantaneous image of the deformation surface of the rotating blade surface, Transformation profilometry calculates the three-dimensional profile of the rotating blade at each instant of moment. Analyzing the digitized results of these three-dimensional profiles can further obtain the deformation of the rotating blade. The experiment of household electric fan verified the rationality and feasibility of this method. The method is expected to be widely used in the study of surface shape and deformation of high-speed moving objects.