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论文类型：期刊论文
发表时间：2015-03-01
发表刊物：OPTICS AND LASERS IN ENGINEERING
收录刊物：SCIE、EI、Scopus
卷号：66
页面范围：249-257
ISSN号：0143-8166
关键字：Nonlinear phase error compensation; Inverse-phase method; Multi-frequency phase unwrapping; Fringe projection profilometry
摘要：A new multi-frequency inverse-phase method was proposed to compensate for nonlinear phase errors in fringe projection profilometry and to measure the three-dimensional shape of discontinuous objects. After introducing a phase offset of pi/4 into the multi-frequency four-step phase-shifting method the corresponding nonlinear phase error reversed its sign, which allowed the addition of unwrapped phases before and after the phase-offset operation to compensate for the error. For the four-step phase-shifting method, simulation analysis showed that the nonlinear phase error had quadrupled the fringe frequency. Moreover, experimental results verified the feasibility and applicability of the proposed method. (C) 2014 Elsevier Ltd. All rights reserved.