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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Resonant Ultrasound Spectroscopy Detection Using a Non-Contact Ultrasound Microphone.

Jake Pretula¹, Nolan Shaw¹, Ayden Chen²

¹Department of Electrical and Computer Engineering, University of Alberta, 9211-116 St. NW, Edmonton, AB T6G 1H9, Canada.

Sensors (Basel, Switzerland)

|October 16, 2025

Summary

Researchers detected the resonant vibrations of small objects using sound. This non-contact method for analyzing vibrational modes could aid in industrial quality control for precision parts.

Keywords:

air-coupled ultrasound non-destructive testing optomechanical sensors resonant ultrasound spectroscopy ultrasonic inspection ultrasound microphone

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Area of Science:

Acoustics
Optomechanics
Materials Science

Background:

Vibrational analysis is crucial for material characterization.
Current methods may require physical contact, limiting applications.
High-frequency ultrasound modes offer detailed insights into material properties.

Purpose of the Study:

To develop a non-contact method for detecting resonant vibrational eigenmodes.
To explore the application of optomechanical microphones in vibrational analysis.
To investigate the feasibility of MHz ultrasound detection for quality control.

Main Methods:

Objects (glass, sapphire lenses) were placed on a piezoelectric shaker.
Objects were excited using broadband noise or frequency sweep signals.
An optomechanical microphone detected airborne vibrational signatures.

Main Results:

High-quality vibrational modes were detected for millimeter-scale objects.
Detection occurred in the approximately 0-8 MHz range.
Observed eigenfrequencies closely matched numerical predictions.

Conclusions:

Non-contact detection of MHz ultrasound vibrational modes is feasible.
This technique shows promise for industrial quality control.
Applications include inspection of ball bearings and lenses.