Deformation reconstruction by means of surface optimization. Part II: time-resolved electronic speckle pattern...

Area of Science:

• Optics and Photonics
• Materials Science
• Mechanical Engineering

Background:

• Accurate measurement of transient surface deformation is crucial for understanding material behavior under dynamic loads.
• Existing methods often lack the spatial or temporal resolution required for high-speed, non-monotonic events.
• Electronic Speckle Pattern Interferometry (ESPI) offers full-field, non-contact measurement capabilities.

Purpose of the Study:

• To develop and validate a time-resolved analysis method for electronic speckle pattern interferograms.
• To achieve full-field, high-speed measurements of transient surface deformation.
• To demonstrate the capability for imaging sub-micrometer amplitude displacements.

Main Methods:

• Utilizing a continuous-wave laser and a high-speed camera to capture dynamic speckle patterns.
• Applying an optimization algorithm for spatiotemporal processing of interferogram data.
• Analyzing out-of-plane deformation of harmonic and transient events in a friction membranophone.

Main Results:

• Successful recovery of time-resolved surface deformation from electronic speckle pattern interferograms.
• Demonstration of imaging high-speed, non-monotonic displacements with sub-micrometer amplitude.
• Accurate recovery of time-resolved amplitude and phase for dynamic events.

Conclusions:

• The developed optimization-based analysis of time-resolved electronic speckle pattern interferograms provides a robust method for full-field transient deformation measurement.
• This technique is suitable for characterizing dynamic events with high spatial and temporal resolution.
• The study successfully validates the method on a friction membranophone, showcasing its practical applicability.