A new method using orthogonal two-frequency grating in online 3D measurement. (September 2016)

• Record Type: Journal Article
• Authors: Peng, Kuang; Cao, Yiping; Wu, Yingchun; Lu, Mingteng
• Is Part Of: Optics & laser technology. Volume 83(2016)
• Page Start: 81
• Page End: 88
• Publication Date: 2016-09
• Subjects: Modulation -- Orthogonal two-frequency grating -- Flat filtering window -- Pixel matching; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2016.03.018
• Languages: English
• ISSNs: 0030-3992

Abstract

Abstract: 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. Highlights: The orthogonal two-frequency grating is proposed to be used in online 3D measurement. The flat filtering window is used to extract better modulation patterns. The modulation patterns are used for pixel matching.