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,因此本文结合偏振相机技术,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,并采用本文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,从而实现空间两步相移。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。
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,this paper proposes a spatial phase-shifting measurement method based on dual-polarization projection calibration 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.
作者
梁妍
尹卓异
何小元
王澄非
LIANG Yan;YIN Zhuoyi;HE Xiaoyuan;WANG Chengfei(School of Instrument Science and Engineering,Southeast University,Nanjing 210096,Jiangsu,China;School of Civil Engineering,Southeast University,Nanjing 210037,Jiangsu,China)
出处
《实验力学》
CSCD
北大核心
2024年第2期158-167,共10页
Journal of Experimental Mechanics
基金
国家自然科学基金重点项目(11532005)
江苏省研究生科研与实践创新计划项目(KYCX220233)。
关键词
栅线投影技术
偏振
两步相移
三维测量
fringe projection profilometry
polarization
two-step phase-shifting
three-dimensional measurement
