Fringe projection profilometry with phase-coded optics

Qi Yan; Suodong Ma; Xu Chen; Feng Xu; Qitai Huang

doi:10.1117/12.2601795

9 October 2021 Fringe projection profilometry with phase-coded optics

Qi Yan, Suodong Ma, Xu Chen, Feng Xu, Qitai Huang

Proceedings Volume 11899, Optical Metrology and Inspection for Industrial Applications VIII; 1189914 (2021) https://doi.org/10.1117/12.2601795
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

Fringe projection profilometry (FPP) is a commonly used tool in the three-dimensional (3D) measurement of diffuse objects in reverse engineering, products online detection, medical diagnosis, etc. However, due to the limited depth-of-field (DOF) of projection-imaging lenses, the contrast of captured sinusoidal fringes will decrease with the increase of defocus, which affects the high-precision acquisition of axial 3D topography. Although the lenses can be designed based on Scheimpflug principle or double-telecentric optical path to extend the DOF, some problems such as off-axis aberration, fixed magnification and limited field-of-view are still existing. To overcome the aforementioned drawbacks, FPP with phase-coded optics is proposed in this paper, where the captured sinusoidal fringe patterns are modulated effectively and the projection-imaging DOF of the system is greatly extended. Experimental results demonstrate the effectiveness of the proposed technique.

Citation Download Citation

Qi Yan, Suodong Ma, Xu Chen, Feng Xu, and Qitai Huang "Fringe projection profilometry with phase-coded optics", Proc. SPIE 11899, Optical Metrology and Inspection for Industrial Applications VIII, 1189914 (9 October 2021); https://doi.org/10.1117/12.2601795

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