title: Three-dimensional shape measurement of a highly reflected, specular surface with structured light method.
abstract: This paper proposes a mathematical measurement model of a highly reflected, specular surface with structured light method. In the measurement, an auxiliary fringe pattern named amplitude perturbation is adopted to be projected onto the measured surface. The amplitude perturbation can ease the procedure of searching the corresponding points between the phase map of the measured surface and that of the reference plane by locking up the most reliable point as the starting unwrapping point whose true phase can be calculated accurately. The proposed method is also suitable for measuring the step surfaces such as gauge blocks with different heights. Furthermore, the image segmentation technology is introduced in the phase unwrapping procedure to increase the speed. Based on the unwrapped phase map, zonal wave-front reconstruction algorithm is implemented to realize three-dimensional, highly reflected, specular surface reconstruction. Experimental studies show that the developed methodology displays accuracy and high stability for highly reflected, specular surface measurement.
authors.affiliation: State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, China. zhanghw@tju.edu.cn
authors.forename: Hongwei
authors.initials: H
authors.lastname: Zhang
authors.forename: Lishuan
authors.initials: L
authors.lastname: Ji
authors.forename: Shugui
authors.initials: S
authors.lastname: Liu
authors.forename: Shaohui
authors.initials: S
authors.lastname: Li
authors.forename: Shujian
authors.initials: S
authors.lastname: Han
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D021621:Imaging, Three-Dimensional / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D008027:Light; D008962:Models, Theoretical; D055620:Optical Phenomena; D013499:Surface Properties