Automatic look-up table based real-time phase unwrapping for phase measuring profilometry and optimal reference frequency selection

Jianwen Song, Daniel L. Lau, Yo Sung Ho, Kai Liu

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

For temporal phase unwrapping in phase measuring profilometry, it has recently been reported that two phases with co-prime frequencies can be absolutely unwrapped using a look-up table; however, frequency selection and table construction has been performed manually without optimization. In this paper, a universal phase unwrapping method is proposed to unwrap phase flexibly and automatically by using geometric analysis, and thus we can programmatically build a one-dimensional or two-dimensional look-up table for arbitrary two co-prime frequencies to correctly unwrap phases in real time. Moreover, a phase error model related to the defocus effect is derived to figure out an optimal reference frequency co-prime to the principal frequency. Experimental results verify the correctness and computational efficiency of the proposed method.

Original languageEnglish
Pages (from-to)13357-13371
Number of pages15
JournalOptics Express
Volume27
Issue number9
DOIs
StatePublished - Apr 29 2019

Bibliographical note

Publisher Copyright:
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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