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Fluorescent 2D Digital Image Correlation With Built‐in Coaxial Illumination for Deformation Measurement in Space‐constrained Scenarios

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Abstract

Background

An advanced two-dimensional digital image correlation (2D-DIC) using active imaging and telecentric imaging has been proposed to overcome the problems of out-of-plane motion and ambient light variation.

Objective

Here, the technique is further improved by combining built-in coaxial illumination and telecentric fluorescent imaging to provide quality 2D-DIC measurement even in space-constrained scenarios.

Method

This improved 2D-DIC firstly excites the fluorescent speckles on the specimen surface using an ultraviolet light source through built-in coaxial illumination, and then employs a monochromatic telecentric imaging system to capture the images of the excited speckles. By tracking the movements of fluorescent speckles using DIC, full-field displacements and strains can be retrieved.

Result

For validation, the quality of speckle images captured by three different 2D-DIC systems was firstly evaluated, proving that the proposed fluorescent 2D-DIC can eliminate the specular reflections and acquire speckle images with the best quality. A uniaxial tensile test of an Al alloy specimen in an environmental chamber and thermal strain measurement of a polymethylmethacrylate sample in a water bath device were performed using the established system, further confirming the practicality of the proposed method.

Conclusions

With the improved performance, compactness, and ease of use, this fluorescent 2D-DIC is expected to be widely applied in future research.

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Funding

This work was support by the National Key Research and Development Program of China (2018YFB0703500), National Natural Science Foundation of China (11925202, 11802008, 11872009 and 11632010).

Author information

Authors and Affiliations

  1. Institute of Solid Mechanics, Beihang University, Beijing, 100191, China

    B. Dong, C. Li & B. Pan

  2. School of Automation, Guangdong University of Technology, Guangzhou, 510006, China

    B. Dong

  3. Beijing Advanced Discipline Center of Unmanned Aircraft System, Beihang University, Beijing, 100191, China

    B. Pan

Authors
  1. B. Dong
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  2. C. Li
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  3. B. Pan
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Corresponding author

Correspondence to B. Pan.

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The authors declare that there is no conflict of interest.

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Dong, B., Li, C. & Pan, B. Fluorescent 2D Digital Image Correlation With Built‐in Coaxial Illumination for Deformation Measurement in Space‐constrained Scenarios. Exp Mech 61, 653–661 (2021). https://doi.org/10.1007/s11340-020-00688-0

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  • DOI: https://doi.org/10.1007/s11340-020-00688-0

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