Overview

In this project, I successfully created a system that uses ultrasonic transducers to achieve stable acoustic levitation of a small polystyrene sphere. The process involved precise calibration and testing to fine-tune key parameters, such as the frequency of the sound waves and the exact alignment of the transducers. Through these adjustments, I was able to create standing waves that trapped the sphere in mid-air at specific pressure points.

One of the more challenging aspects was ensuring the precision of the setup. I designed and built a custom modular system that allowed me to control the distance between the transducers with a high degree of accuracy—down to 0.01 mm. This level of control was crucial for maintaining the stable levitation of the sphere. Additionally, I developed the electronics and software to automate this process, using motors and control algorithms to achieve the fine adjustments required.

Approach

I used two ultrasonic transducers placed opposite each other to generate standing waves. These standing waves created pressure nodes where objects could be levitated. I calculated the correct frequency and adjusted the alignment of the transducers automatically with a precision of 0.01 mm to achieve stable levitation.

• I programmed a control system to adjust the frequency and voltage of the sound waves. This allowed me to fine-tune the system for optimal levitation conditions. I also conducted multiple tests to determine the ideal spacing between the transducers and the most effective frequency.
• I modeled the setup in 3D using Fusion 360 software to ensure the accurate positioning of the components. After building the system, I ran experiments to fine-tune the transducers and achieve consistent levitation and made a research paper about my findings.