Abstract
Fiber-optic interference fringe projection profilometry for high-precision 3D (Three-dimensional) shape reconstruction which is insensitive to external electromagnetic disturbances. We designed a system which takes advantage of Mach–Zehnder interferometer structure and Young’s double pinhole interference principle to realize fringe projection, while utilizing Fresnel reflection on fiber end face and interference to constitute close-loop feedback model, achieving precise control of the projected fringe phase with PTAC (AC Phase Tracking). A root-mean-square phase stability of 4mrad. The spin filter is used for eliminating the noise, meanwhile preserving details of the fringes; finally we realized real-time 3D shape retrieving through Fourier transformation profilometry, the measuring time of the whole system is less than 250ms.
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