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Multi-mirror-aided digital image correlation for internal and external panoramic deformation measurement.
Applied Optics
|August 12, 2025
Summary
This study introduces a novel multi-mirror digital image correlation method for panoramic deformation measurement in tubular structures. The technique accurately captures interior and exterior surface morphology and strain, aiding defect detection.
Area of Science:
- Mechanical Engineering
- Optical Measurement Techniques
- Materials Science
Background:
- Accurate measurement of both internal and external deformation in tubular structures is crucial for structural integrity assessment.
- Existing methods often struggle with simultaneous panoramic imaging of both surfaces, limiting comprehensive analysis.
- Defect detection and strain concentration analysis require high-resolution, full-field measurement capabilities.
Purpose of the Study:
- To develop and validate a novel variable-attitude multi-mirror-assisted digital image correlation (DIC) method.
- To achieve simultaneous panoramic measurement of the interior and exterior deformation of tubular structures.
- To enhance the accuracy and comprehensiveness of deformation analysis and defect detection in pipes.
Main Methods:
- A co-axial imaging system with three variable-attitude optical mirrors was designed for panoramic acquisition.
- Mirror arrangement and attitude adjustment enabled simultaneous imaging of interior and exterior pipe surfaces.
- Digital image correlation (DIC) algorithms, including coordinate conversion, were applied to acquired images for 3D deformation analysis.
Main Results:
- The method successfully performed simultaneous panoramic measurement of morphology and 3D deformation for both interior and exterior pipe surfaces.
- Experimental validation confirmed the accuracy of the DIC method in quantifying strain and identifying strain concentration areas, especially near defects.
- The system demonstrated stability and repeatability under various loading conditions, proving its reliability.
Conclusions:
- The developed variable-attitude multi-mirror DIC method provides a powerful tool for comprehensive mechanical analysis of tubular structures.
- The technique enables accurate defect detection and quantification of strain concentrations, improving structural health monitoring.
- This approach offers significant advantages for non-destructive testing and analysis of pipes and similar geometries.
