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A setup using fringe projection techniques to perform 3D profile measurements for transparent objects is presented. The related mathematical equations are derived as well. A fringe pattern is illuminated onto the transparent object. Fringes passing through the inspected object are then projected onto a screen. A CCD camera is employed to record the transmitted fringes on the screen. Fringe on the screen are deformed by the refractive index and the surface structure, and therefore are desirable to describe the shape of the inspected sample.
Wei-Hung Su andChau-Jern Cheng
"Mathematical expressions using fringe projections for transparent objects", Proc. SPIE 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI, 103820M (23 August 2017); https://doi.org/10.1117/12.2275326
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Wei-Hung Su, Chau-Jern Cheng, "Mathematical expressions using fringe projections for transparent objects," Proc. SPIE 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI, 103820M (23 August 2017); https://doi.org/10.1117/12.2275326