期刊
OPTICS AND LASERS IN ENGINEERING
卷 154, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2022.107021
关键词
Fringe projection; phase mask; scatter plate; high speed; binary projection
类别
资金
- Engineering and Physical Sciences Research Council [EP/P006930/1]
This paper describes the design of a binary fringe projector using a binary phase mask to enhance performance. The anisotropic point spread function of the phase mask produces a well-defined blur of fringes parallel to the fringe direction, minimizing degradation of fringe contrast. Two new binary fringe design methods are proposed, and expressions for phase noise are derived.
Projection rates of up to 30,000 greyscale fringe patterns per second have been achieved recently by defocusing binary fringe patterns from a digital micromirror device (DMD) based projector. Part 1 of this two-part paper describes the design of a binary phase mask, based on a virtual scatter plate, for the purpose of enhancing the performance of a binary fringe projector. The phase mask's anisotropic point spread function (PSF) produces a well-defined blur of the fringes parallel to the fringe direction, thereby minimising degradation of fringe contrast. The shape of the PSF is also shown, by means of a polychromatic Fourier optics model, to be insensitive to projection distance over a range of +/- 10% of the standoffdistance. Two new binary fringe design methods are proposed, including extensions to optimize the system performance in the case of a mismatch between camera and projector framing rates. Expressions for the phase noise are derived as a function of the phase mask design parameters, which demonstrate that fringe quality comparable to traditional 8-bit greyscale fringes is achievable at projection rates over two orders of magnitude higher.
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