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Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
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Note: High-speed optical imaging powered by acoustic emission triggering.
1Laboratory for the Physics of Strength of Materials and Intelligent Diagnostic Systems, Togliatti State University, Togliatti 445667, Russian Federation and Laboratory for Advanced Materials, Kazan Federal University, Naberezhnye Chelny, 423812, Republic of Tatarstan, Russian Federation.
The Review of Scientific Instruments
|August 3, 2014
Summary
This study introduces an efficient triggering method for high-speed video recording of rapid events in solids, using acoustic emission detection. The technique successfully captures localized shear bands and mechanical twinning in materials.
Area of Science:
- Materials Science
- Mechanical Engineering
- Physics
Background:
- Observing rapid events in loaded solids requires precise triggering of high-speed imaging systems.
- Unpredictable event timing poses a significant challenge for capturing dynamic phenomena in materials.
Purpose of the Study:
- To develop and demonstrate an efficient triggering method for optical imaging systems to record rapid events in solids.
- To utilize acoustic emission (AE) signals for precise event triggering in high-speed video recording.
Main Methods:
- Implementation of a triggering system linked to a highly sensitive acoustic emission (AE) technique.
- Application of the AE-triggered optical imaging system to study material deformation processes.
- Analysis of high-speed video recordings of shear band initiation/propagation and mechanical twinning.
Main Results:
- The proposed AE-based triggering method enables efficient high-speed video recording of unpredictable rapid events.
- Successful observation of the initiation and propagation of highly localized shear bands in metallic glasses.
- Detailed visualization of mechanical twinning in magnesium (Mg) polycrystals was achieved.
Conclusions:
- The acoustic emission technique provides an effective trigger for high-speed optical imaging of dynamic events in solids.
- This method enhances the study of localized deformation mechanisms, such as shear banding and twinning.
- The developed technique is valuable for investigating rapid material failure and deformation processes.
