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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） |
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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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