title: Grating projection system for surface contour measurement.
abstract: A grating projection system is a low-cost surface contour measurement technique that can be applied to a wide range of applications. There has been a resurgence of interest in the technique in recent years because of developments in computer hardware and image processing algorithms. We describe a method that projects a phase-shifted grating through a lens on an object surface. The deformed grating image on the object surface is captured by a CCD camera for subsequent analysis. Phase variation is achieved by a linear translation stage on which the grating is mounted. We compare the experimental results with the test results using a mechanical stylus method.
authors.affiliation: Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
authors.forename: Cho Jui
authors.initials: CJ
authors.lastname: Tay
authors.forename: Madhuri
authors.initials: M
authors.lastname: Thakur
authors.forename: Chenggen
authors.initials: C
authors.lastname: Quan