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提出了一种基于条纹反射和相移技术的类镜面三维面形测量的新方法。首先在平板显示器上显示正弦条纹,然后用CCD相机分别记录由待测面和标准面反射的正弦条纹像,通过相移得到各自的相位分布,与标准面相位分布相比较得到待测表面起伏引起的相位变化。推导了相位变化量与待测表面梯度的对应关系,分别对待测面进行水平和垂直两个方向光栅相位测量,通过计算可得到梯度分布并由梯度分布恢复待测表面面形。同时初步分析了影响条纹反射技术测量精度的因素。测量中,光栅由计算机产生,可以实现精确的相移,而且可以方便地调节光栅的周期及方向,通过预设标记点来引导相位展开有效地解决待测面和标准面的条纹对应问题。实测了建筑用釉面瓷砖表面起伏,验证了该方法的可行性。
A new method of mirror-like three-dimensional surface measurement based on fringe reflection and phase shift technique is proposed. Firstly, the sine fringes are displayed on the flat panel display, and then the sinusoidal fringes reflected by the test surface and the reference surface are respectively recorded by the CCD camera. The phase distributions of the sine fringes are obtained by phase shift, and the surface distribution of the test surface is compared with that of the standard surface The phase change. The corresponding relationship between the phase change and the measured surface gradient is deduced. The horizontal and vertical grating phase measurements of the surface to be measured are respectively measured. The gradient distribution can be obtained through calculation and the surface profile to be measured can be restored by gradient distribution. At the same time, the factors influencing the measurement accuracy of streak reflection are analyzed preliminarily. In the measurement, the grating generated by the computer can achieve accurate phase shift, and can conveniently adjust the period and direction of the grating, and guide the phase unwinding through the preset points to effectively solve the problem of the fringe corresponding to the test surface and the standard surface. The measured glaze tile surface roughness, verify the feasibility of the method.