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Adjusting single-axis acoustic levitators in real time using rainbow schlieren deflectometry.

Victor Contreras1, Asier Marzo2

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Summary

This study introduces a simple real-time method using rainbow schlieren deflectometry to visualize acoustic fields for optimizing acoustic levitation devices. This technique enables efficient alignment, leading to the successful levitation of steel and mercury.

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Area of Science:

  • Physics
  • Acoustics
  • Optical Measurement Techniques

Background:

  • Acoustic levitation utilizes high-intensity airborne ultrasound to suspend particles, finding applications in spectrometry, lab-on-a-droplet systems, and display technologies.
  • Optimal alignment of transducer arrays is crucial for effective acoustic levitator performance.

Purpose of the Study:

  • To develop and demonstrate a simple, real-time method for visualizing the 2D acoustic field of levitation systems.
  • To optimize acoustic levitator alignment for improved performance and reduced power consumption.
  • To enable the levitation of previously challenging materials like steel and mercury.

Main Methods:

  • Rainbow schlieren deflectometry was employed to visualize the acoustic field in real time.
  • Acoustic pressure fields were simulated and compared with experimental schlieren images.
  • Levitator alignment was optimized by correlating visual field data with minimum power consumption.

Main Results:

  • The rainbow schlieren technique provided real-time 2D projections of the acoustic field, showing good agreement with acoustic pressure simulations.
  • Optimal levitator alignment, identified by minimum power consumption, corresponded to maximum acoustic field amplitudes.
  • Successful levitation of steel and mercury was achieved for the first time using an optimized off-the-shelf acoustic levitation system.

Conclusions:

  • Rainbow schlieren deflectometry is an effective and accessible tool for visualizing and optimizing acoustic levitation systems.
  • The correlation between minimum power consumption and maximum acoustic field amplitude offers a practical method for levitator adjustment.
  • This optimized approach broadens the capabilities of acoustic levitation, including the manipulation of denser materials.