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Updated: Dec 8, 2025

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

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Published on: May 23, 2017

High-resolution optical microscopy for characterising microstructural deformation in microtensile testing.

J Wanni¹, J G Michopoulos², A Bagchi²

¹Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York, U.S.A.

Journal of Microscopy

|September 21, 2020

Summary

This summary is machine-generated.

This study introduces an image processing technique to improve optical microscopy for observing material deformation. The method enhances focus and accuracy in imaging microstructural changes during tensile testing.

Keywords:

Image blending image stabilisation microstructural deformation microtensile testing optical microscopy

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Area of Science:

Materials Science
Optical Engineering
Microscopy

Background:

Optical microscopes have a narrow depth of field (DoF), limiting imaging of complex 3D surface deformations during microtensile testing.
Heterogeneous materials exhibit evolving 3D surface textures under load, further challenging microscopy by reducing the in-focus region within the field of view (FoV).

Purpose of the Study:

To develop and validate an image processing method to overcome the DoF limitation in optical microscopy for surface deformation analysis.
To enhance the characterization of heterogeneous material deformation during tensile testing.

Main Methods:

A novel method combining image blending and image stabilization is proposed.
Image blending merges in-focus regions from multiple frames captured at varying working distances to create a large-focus image.
Image stabilization corrects spatial misalignments in blended images using a common reference feature.

Main Results:

The proposed method significantly improves image quality, maintaining nearly 100% FoV in focus despite substantial out-of-plane deformation.
Validated on stainless steel 316L specimens, the technique enhanced the accuracy of digital image correlation (DIC).
Time-lapse videos revealed slip band evolution and transmission through twinning boundaries in the microstructure.

Conclusions:

The developed image-processing technique effectively advances optical microscopy capabilities for imaging dynamic, complex 3D surface changes.
This method offers a feasible approach for detailed analysis of material deformation at the microscale.