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Modified Michelson Interferometer Based Dual Shearing Single Camera Digital Sherography

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Abstract

This paper presents a modified, Michelson Interferometer based single camera digital shearography setup which enables simultaneous measurement of multiple shearing directions. Digital shearography is a non-contact, high precision, anti-turbulence optical approach for testing of minor deformation gradients. As a measuring instrument, however, its application is limited, due to its reliance on the shearing direction to determine the type of data that is measured. For a single test, the conventional shearographic method can only work in a single shearing direction, resulting in the need for multiple tests with different shearing directions to be performed to obtain dual direction information. Various setups have been proposed to solve this issue and improve work efficiency; while some perform well, they may also introduce new problems, such as unstable structure, high cost and power loss. This paper introduces a new setup that was developed by referring to the advantages of previous studies to avoid the omission of defect detection. The setup presented, which is based on the modified Michelson Interferometer, uses an additional polarization Michelson interferometer as a substitute for one arm of the normal interferometer. This enables an object reflection wave to be divided into three parts. Two of the waves are separated into a 90-degree polarized difference with no cross interference while the other part, which is acquired in the normal interferometer, has no polarization. The two polarized waves are sheared in perpendicular directions and converge with the wave with no polarization on the CCD plane. Thus, two shearograms with no cross interference are achieved. Time-dependent phase shifting cannot be used for measuring the transient process and separating holograms. Thus, the spatial phase shift method is adopted to restore the information. The application is of a significant practical interest because dual direction information can be obtained synchronously by taking advantage of a simple setup and low power loss.

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Acknowledgments

The authors would like to express their sincere thanks to Mr. Bernard Sia, who made careful correction of the manuscript as well as the English.

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Authors and Affiliations

  1. Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, USA

    B. Zhang, W. Xu, J. Li & L. Yang

  2. Dantec Dynamics GmbH, Ulm, Germany

    T. Siebert

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  1. B. Zhang
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  2. W. Xu
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  3. J. Li
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  4. T. Siebert
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  5. L. Yang
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Correspondence to L. Yang.

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Zhang, B., Xu, W., Li, J. et al. Modified Michelson Interferometer Based Dual Shearing Single Camera Digital Sherography. Exp Tech 44, 187–195 (2020). https://doi.org/10.1007/s40799-019-00345-9

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  • DOI: https://doi.org/10.1007/s40799-019-00345-9

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