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基于偏振投影与空域耦合的两步相移测量方法
Two-step phase-shifting method based on polarization projection and spatial coupling
投稿时间:2023-04-09  修订日期:2023-05-06
DOI:
中文关键词:  栅线投影技术  偏振  两步相移  三维测量
英文关键词:fringe projection profilometry  polarization  two-step phase-shifting  three-dimensional measurement
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
梁妍 东南大学 210096
尹卓异 东南大学 211102
何小元 东南大学 211102
王澄非* 东南大学 210096
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中文摘要:
      栅线投影测量是一种被广泛采用的非接触、高精度三维形貌测量方法。然而由于时间相移技术不能在同一时刻采集相移图像,导致这一技术在工业在线检测中难以发挥应有的作用。因此结合偏振相机技术,提出了一种基于双偏振投影校正的空间相移测量方法。该方法通过在一对投影仪镜头前加装偏振方向正交的线偏振片,采用所提出的投影仪自校正方法,将具有恒定相移量、但偏振方向不同的相移栅线图案投影到待测物体表面。利用偏振相机单帧采集即可获得不同偏振方向的2幅相移图像,实现空间两步相移。实验结果表明,该方法对于非消偏振表面具有很好的测量效果,2幅相移图像的采集时间与相机曝光时间相同,可以用于在线测量。
英文摘要:
      Fringe projection profilometry is a widely used non-contact, high-precision three-dimensional shape measurement method. However, due to the inability of temporal phase-shifting technology to capture phase-shifted images at the same time, it is difficult for this technology to play its due role in industrial online detection. Therefore, a spatial phase-shifting measurement method based on dual-polarization projection calibration is proposed in combination with polarization camera technology. In this method, linear polarization filters with orthogonal polarization directions are installed in front of a pair of projector lenses, and the proposed projector self-calibration method is used to project the fringe pattern with constant phase-shifting but different polarization directions onto the surface of the object to be measured. Consequently, two phase-shifted images with different polarization directions can be obtained to achieve spatial two-step phase-shifting in single-shot. The experimental results show that this method has a good measurement effect on non-depolarized surfaces, and the acquisition time of the two phase-shifted images is the same as the exposure time of the camera, which can be used for online measurement.
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