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Updated: Jul 2, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

Versatile resonance-tracking circuit for acoustic levitation experiments.

K Baxter¹, R E Apfel, P L Marston

¹Department of Engineering and Applied Science, Yale University, New Haven, Connecticut 06520.

The Review of Scientific Instruments

|February 1, 1978

Summary

A novel self-locking oscillator circuit maintains acoustic resonance for object levitation. This system tracks frequency changes by monitoring transducer current, ensuring stable acoustic standing waves for precise manipulation.

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Area of Science:

Acoustic physics
Resonant systems engineering
Mechatronics

Background:

Acoustic standing waves utilize radiation pressure for object levitation.
Maintaining stable acoustic resonance is crucial for consistent levitation despite environmental or system variations.

Purpose of the Study:

To describe a self-locking oscillator circuit for acoustic levitation.
To enable the system to actively track and maintain resonance frequency.

Main Methods:

Development of a self-locking oscillator circuit.
Sensing the magnitude of the transducer current to detect resonance frequency shifts.
Implementing a feedback mechanism to lock onto the acoustic resonance.

Main Results:

The described circuit successfully tracks resonance frequency fluctuations.
Stable acoustic standing waves are maintained, crucial for reliable object levitation.
The transducer current magnitude serves as an effective indicator of resonance.

Conclusions:

The self-locking oscillator circuit provides a robust method for maintaining acoustic resonance.
This technology can be applied to various resonant systems requiring frequency stabilization.
The principle offers enhanced control and stability in acoustic manipulation applications.