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Accuracy of the Sampling Moiré Method and its Application to Deflection Measurements of Large-Scale Structures

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Abstract

Measuring accurate displacement distributions for large-scale structures is an important issue and a very challenging task. Recently, a simple and accurate phase measurement technique called sampling moiré method [Exp Mech 50–4:501–508, (2010)] has been developed for small-displacement distribution measurements. In this method, the phase distribution of moiré fringes can be analyzed from a single grating image by simultaneously performing down-sampling image processing and intensity-interpolation to generate multiple phase-shifted moiré fringe images. In addition, the phase of the original grating can also be obtained from the phase of the moiré fringe by adding the phase of the sampling grating. In this study, the measurement accuracy of the sampling moiré method was analyzed through computer simulations and a displacement measurement experiment. Four factors of the sampling moiré method were investigated, including the sampling pitch, the order of the intensity-interpolation, random noise, and the form of grating. The results show that determining the optimal sampling pitch is an important factor for obtaining better results but it is not critical. In addition, a practical application of the sampling moiré method is presented that involves a deflection measurement on a 10-meter-long crane. The experimental results demonstrate that submillimeter deflections of the crane can be successfully detected.

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Authors and Affiliations

  1. Department of Nanomechanics, Graduate School of Engineering, Tohoku University, Aoba 6-6-01, Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    S. Ri (SEM member), T. Muramatsu & M. Saka

  2. Electric Power Research & Development Center, Chubu Electric Power Co., Inc., Kitasekiyama 20-1, Ohdaka-Cho, Midoriku, Nagoya, 458-8522, Japan

    K. Nanbara & D. Kobayashi

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  1. S. Ri
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  2. T. Muramatsu
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  3. M. Saka
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  4. K. Nanbara
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  5. D. Kobayashi
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Correspondence to S. Ri.

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Ri, S., Muramatsu, T., Saka, M. et al. Accuracy of the Sampling Moiré Method and its Application to Deflection Measurements of Large-Scale Structures. Exp Mech 52, 331–340 (2012). https://doi.org/10.1007/s11340-011-9491-2

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  • DOI: https://doi.org/10.1007/s11340-011-9491-2

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