Improving the measurement accuracy of shadow moiré by three-step random phase-shifting algorithm

Hubing Du; Jianhong Yu; Shaofeng Zhang

doi:10.1117/1.OE.57.5.054107

16 May 2018 Improving the measurement accuracy of shadow moiré by three-step random phase-shifting algorithm

Hubing Du, Jianhong Yu, Shaofeng Zhang

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 054107 (May 2018). https://doi.org/10.1117/1.OE.57.5.054107

Abstract

Phase-shifting shadow moiré is an efficient technique for three-dimensional (3-D) shape measurement, but the technique is always suffered from the error of phase shifter. A three-frame random phase-shifting algorithm is proposed to relax the requirements of repeatability and accuracy of the phase shifter in a shadow moiré system. The proposed method can act as a bridge between the three phase-shifting analysis methods and two-shot phase-shifting methods. The value of introduced arbitrary and unknown phase shift can be calculated by a determinate formula. The algorithm has the advantages of being free from the disturbance of background elimination and less computation. In addition, the proposed method is immune to nonsinusoidal fringe patterns and can be implemented easily in many applications. Both simulation and optical experimental results verify the feasibility of this method.

Citation Download Citation

Hubing Du, Jianhong Yu, and Shaofeng Zhang "Improving the measurement accuracy of shadow moiré by three-step random phase-shifting algorithm," Optical Engineering 57(5), 054107 (16 May 2018). https://doi.org/10.1117/1.OE.57.5.054107

Received: 20 February 2018; Accepted: 2 May 2018; Published: 16 May 2018

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