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Dynamic measurement of first-order spatial derivatives of deformations by digital shearography

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Abstract

This paper presents a simple spatial phase shift shearography based on the Michelson interferometer. A novel digital shearography set-up with a large angle of view, which is based on a 4f system is demonstrated. In the system, the Michelson interferometer is used as a shearing device to generate a shearing distance by tilting a small angle in one of the two mirrors. In fact spherical wave fronts become plane after going through the first lens in 4f system. Tilting the mirror in the Michelson interferometer also generates spatial carrier frequency. Sinusoid fitting method is applied to evaluate the phase. This system can generate a phase map of shearography by using only a single image. The effects of shearing angle, the choice of algorithm and comparison result are discussed in detail. The theory and the application are presented.

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Authors and Affiliations

  1. School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China

    Jianfei Sun, Yonghong Wang, Xinya Gao & Lianxiang Yang

  2. Department of Measurement-Control Technology and Instrumentation, Beijing Information Science and Technology University, Haidian District, Beijing, 100192, China

    Sijin Wu & Lianxiang Yang

  3. Optical Laboratory, Department of Mechanical Engineering, Oakland University, Rochester, Michigan, 48309, USA

    Lianxiang Yang

Authors
  1. Jianfei Sun
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  2. Yonghong Wang
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  3. Xinya Gao
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  4. Sijin Wu
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  5. Lianxiang Yang
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Correspondence to Yonghong Wang.

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Sun, J., Wang, Y., Gao, X. et al. Dynamic measurement of first-order spatial derivatives of deformations by digital shearography. Instrum Exp Tech 60, 575–583 (2017). https://doi.org/10.1134/S0020441217040145

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  • DOI: https://doi.org/10.1134/S0020441217040145

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