Deformation reconstruction by means of surface optimization. Part I: Time-averaged electronic speckle pattern...

Area of Science:

• Optical Metrology
• Experimental Mechanics
• Vibration Analysis

Background:

• Electronic speckle pattern interferometry (ESPI) is a standard technique for full-field deformation measurement.
• Accurate reconstruction of vibration deflection shapes using ESPI remains an active research area.
• Phase map calculation in ESPI is often challenging, particularly for determining the relative phase of vibrating objects.

Purpose of the Study:

• To introduce an alternative phase reconstruction method for ESPI.
• To address the limitations of direct transformation methods for calculating phase maps.
• To enhance the accuracy and spatial resolution in analyzing complex vibration patterns.

Main Methods:

• Developed a novel phase reconstruction approach by solving the inverse problem.
• Employed surface optimization techniques for phase recovery.
• Experimental validation using electronic speckle pattern interferometry.

Main Results:

• The proposed surface optimization method enables accurate phase reconstruction from interferometric images.
• Achieved higher spatial resolution compared to traditional direct transformation methods.
• Demonstrated suitability for analyzing complex vibration patterns.

Conclusions:

• The surface optimization method offers a significant advancement in ESPI for vibration analysis.
• This technique provides a more robust and precise way to determine deflection shapes of vibrating surfaces.
• The improved spatial resolution opens new possibilities for detailed analysis of dynamic structural behavior.