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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Flow Field Imaging With Ultrasonic Guided Waves for Exploring Metallic Melts
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 29, 2017
Summary
This study introduces the time-reversal virtual array (TRVA) method for ultrasonic flow imaging in harsh industrial settings. The TRVA method enables accurate velocity measurements in liquid metals, overcoming signal scrambling issues in multimode waveguides.
Area of Science:
- Physics
- Materials Science
- Engineering
Background:
- Ultrasonic guided waves are crucial for flow measurements in demanding industrial environments like solidification processes.
- Single-mode waveguides prevent transducer overheating but necessitate mechanical scanning for imaging.
- Multimode waveguides offer imaging capabilities but suffer from signal scrambling due to boundary reflections.
Purpose of the Study:
- To introduce and validate the time-reversal virtual array (TRVA) method for ultrasonic flow imaging.
- To overcome signal scrambling in multimode waveguides for enhanced flow visualization.
- To demonstrate real-time flow measurement in challenging media.
Main Methods:
- Theoretical, numerical, and experimental characterization of the TRVA method.
- Utilizing the time invariance of the wave equation for signal refocusing.
- Employing a short borosilicate waveguide for measurements.
Main Results:
- The TRVA method effectively overcomes signal scrambling in multimode waveguides.
- Demonstrated planar velocity measurement of rotating liquid gallium-indium-tin.
- Achieved good agreement between TRVA measurements and reference data.
Conclusions:
- The TRVA method enables robust ultrasonic flow imaging through short waveguides.
- This technique is suitable for harsh industrial conditions and complex fluid dynamics.
- The study presents the first successful demonstration of flow imaging in liquid metals using this approach.
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