Abstract
In this article, we describe a three-dimensional shape reconstruction system based on the Mach–Zehnder interferometer structure and Young's double pinhole interference principle, while utilizing Fresnel reflection on fiber end face and interference at the fourth port of 3-dB coupler to achieve closed-loop precise control of fringe phase. A root-mean-square phase stability of 4 mrad is measured with the system. The shape of the object is determined by analyzing the fringe pattern. A new algorithm called rotating rectangular window autoselection is used as the band-pass filter. The measuring time of the whole system is less than 200 ms, and the error of system is 0.27 mm. Meanwhile, the overall complexity of the measuring algorithm is O(nlogn). © 2012 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 22, 208–213, 2012 © 2012 Wiley Periodicals, Inc.
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