High-speed fringe projection for robot 3D vision system

W. Guo; C. R. Coggrave; J. M. Huntley; H. G. Dantanarayana; P. D. Ruiz

doi:10.1117/12.2556471

1 April 2020 High-speed fringe projection for robot 3D vision system

W. Guo, C. R. Coggrave, J. M. Huntley, H. G. Dantanarayana, P. D. Ruiz

Proceedings Volume 11352, Optics and Photonics for Advanced Dimensional Metrology; 113520F (2020) https://doi.org/10.1117/12.2556471
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

The design, manufacture and test of a custom-made phase mask for use in a high-speed fringe projection system is presented. The mask produces a controlled anisotropic point spread function (PSF) that blurs binary fringes parallel to the fringe direction, to produce high quality greyscale patterns at up to the maximum projection rate, 22,000 frames s-1, of the DMD (Digital Micromirror Device)-based projector. The paper describes the numerical design method based on a binary scatter plate; a polychromatic Fourier optics model to predict the device’s optical performance; a method to design the fringe patterns; the manufacturing process, based on photolithography and reactive ion etching; and experimental validation of the phase mask performance. Noise in the computed height-encoding phase maps is found to be just 22% higher than for 8-bit greyscale fringe patterns produced by traditional temporal integration through a sequence of bit planes, but the projection rate is increased by over two orders of magnitude.

Conference Presentation

Citation Download Citation

W. Guo, C. R. Coggrave, J. M. Huntley, H. G. Dantanarayana, and P. D. Ruiz "High-speed fringe projection for robot 3D vision system", Proc. SPIE 11352, Optics and Photonics for Advanced Dimensional Metrology, 113520F (1 April 2020); https://doi.org/10.1117/12.2556471

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