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Fast and accurate deflectometry with crossed fringes

  • Yuankun Liu EMAIL logo , Evelyn Olesch , Zheng Yang und Gerd Häusler
Veröffentlicht/Copyright: 16. Juli 2014
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Abstract

Phase measuring deflectometry (PMD) acquires the two components of the local surface gradient via a sequence of two orthogonal sinusoidal fringe patterns that have to be displayed and captured separately. We will demonstrate that the sequential process (different fringe directions, phase shifting) can be completely avoided by using a cross fringe pattern. With an optimized Fourier evaluation, high quality data of smooth optical surfaces can be acquired within one single shot. The cross fringe pattern allows for one more improvement of PMD: we will demonstrate a novel phase-shift technique, where a one-dimensional N-phase shift allows for the acquisition of the two orthogonal phases, with only N exposures instead of 2N exposures. Therefore, PMD can be implemented by a one-dimensional translation of the fringe pattern, instead of the common two-dimensional translation, which is quite useful for certain applications.


Corresponding author: Yuankun Liu, Opto-Electronic Department, Sichuan University, Chengdu 610065, China; and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Erlangen, 91058, Germany, e-mail:

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Received: 2014-4-22
Accepted: 2014-6-23
Published Online: 2014-7-16
Published in Print: 2014-8-1

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