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Accurate three-dimensional shape and deformation measurement at microscale using digital image correlation.

Maodong Ren1, Jin Liang1, Leigang Li2

  • 1School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

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This study presents a non-contact method using a stereomicroscope and digital image correlation (DIC) to measure 3D shape and deformation in miniature specimens. The developed system accurately captures microscale data for material analysis.

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Area of Science:

  • Microscopic measurement systems
  • Optical metrology
  • Materials science

Background:

  • Accurate measurement of 3D shape and deformation is crucial for understanding material behavior at microscale.
  • Existing techniques may face limitations in precision and non-contact capabilities for miniature specimens.

Purpose of the Study:

  • To develop and validate a non-contact microscale measurement technique for 3D shape and deformation analysis.
  • To create a microscopic measurement system integrating a stereomicroscope and digital image correlation (DIC).

Main Methods:

  • Utilizing a stereomicroscope with a dual-camera setup to capture stereo micrographs of a speckle-patterned specimen.
  • Implementing an equivalent relative calibration method with a priori warping functions to correct distortions and optimize stereomicroscope parameters.
  • Employing a 1D synchronous stereo matching method based on DIC and image rectification for identifying corresponding points.
  • Reconstructing 3D shape and calculating full-field deformation from temporal micrographs.

Main Results:

  • Successful development of a microscopic measurement system for non-contact 3D shape and deformation measurement.
  • Demonstrated accuracy in correcting complex optical paths and high magnification distortions.
  • Effective identification of discontinuous corresponding points for precise 3D reconstruction.
  • Validation of the technique's effectiveness and accuracy through experimental verification.

Conclusions:

  • The presented non-contact stereomicroscope and DIC-based technique provides accurate microscale 3D shape and deformation measurement.
  • The developed system and calibration methods are effective for analyzing miniature specimens.
  • This advancement offers a valuable tool for materials science research and engineering applications.