Enhanced dual-frequency pattern scheme based on spatial-temporal fringes method |
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Authors: | Minmin Wang Shuchun Si Xiaolei Li Hui Li |
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Affiliation: | 1. School of Physics, Shandong University, Jinan, China;2. School of Mechanical Engineering, Hebei University of Technology, Tianjin, China |
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Abstract: | One of the major challenges of employing a dual-frequency phase-shifting algorithm for phase retrieval is its sensitivity to noise. Yun et al proposed a dual-frequency method based on the Fourier transform profilometry, yet the low-frequency lobes are close to each other for accurate band-pass filtering. In the light of this problem, a novel dual-frequency pattern based on the spatial-temporal fringes (STF) method is developed in this paper. Three fringe patterns with two different frequencies are required. The low-frequency phase is obtained from two low-frequency fringe patterns by the STF method, so the signal lobes can be extracted accurately as they are far away from each other. The high-frequency phase is retrieved from another fringe pattern without the impact of the DC component. Simulations and experiments are conducted to demonstrate the excellent precision of the proposed method. |
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Keywords: | Phase retrieval profilometry phase-shifting algorithm Fourier transform dual-frequency pattern |
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