A new method using orthogonal two-frequency grating in online 3D measurement

作者：Peng, Kuang; Cao, Yiping^*; Wu, Yingchun; Lu, Mingteng

来源：Optics and Laser Technology, 2016, 83: 81-88.

DOI：10.1016/j.optlastec.2016.03.018

• Modulation
• Orthogonal two-frequency grating
• Flat filtering window
• Pixel matching

In online 3D measurement, a new method using orthogonal two-frequency grating based on Phase Measuring Profilometry(PMP) is proposed. The modulation of the entire measured object is used to match pixels and this proposed method successfully resolves the contradiction of the demand for different frequency fringes between the extraction of the modulation information and the phase unwrapping. The high-frequency fringe is used to catch the better modulation patterns for pixel matching, and the low-frequency fringe is used to calculate the phase distribution and avoid phase unwrapping error. In addition, to extract the better modulation patterns for pixel matching, the flat filtering window replaces the circular filtering window to avoid the spectrum aliasing phenomenon. The simulations and experiments show its feasibility.

• 出版日期2016-9
• 单位四川大学