基于投影栅线法测量物体三维轮廓的一点改进

Three-dimensional profilometry improvement based on grating projection

研究了利用投影栅线法测量光滑鼠标的三维轮廓。对传统的傅里叶变换轮廓术提出了一点改进,在傅里叶变换之后,不对频谱部分频移,而是直接滤出需要的高、低频部分,再分别进行傅里叶逆变换,就可以得到与高度有关的相位差。该方法与传统的方法相比,减少了3次频移的过程,大大减少了计算量,也提高了滤波的精度。实验结果表明:只需要0.1s就可以完成测量过程,测量精度达到0.2mm,可以成功实现光滑物体的三维轮廓测量。

Grating projected method was used to measure the three-dimensional profile of smooth mouse. The traditional Fourier transform profilometry was improved. The signals were directly filtered without frequency shift after Fourier transform, then inverse Fourier transform was performed and the phase difference relative to the height was obtained. Compared with the traditional Fourier transform profilometry, the method removes three frequency shifts, greatly reduces calculation complexity and improves filtering accuracy. It takes 0. 1 second to measure three-dimensional profile with the accuracy of 0.2 mm. The result indicates that the method could be used for smooth object measurement with good accuracy and efficiency.