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Related Experiment Video

Updated: Oct 26, 2025

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Ultrasound Signal Detection with Multi-bounce Laser Microphone.

Qianqian Wan¹, ChenChia Wang², Keshuai Xu³

¹Department of Biomedical Engineering, Johns Hopkins University, Baltimore, United States.

IEEE International Ultrasonics Symposium : [Proceedings]. IEEE International Ultrasonics Symposium

|July 26, 2021

Summary

This study introduces a multi-bounce laser microphone for advanced ultrasound imaging. The all-optical technique enhances signal-to-noise ratio (SNR) for high-fidelity detection across a wide frequency range.

Keywords:

all-optical sensing laser laser microphone photoacoustic imaging signal-to-noise ratio ultrasound signal detection

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Last Updated: Oct 26, 2025

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Published on: October 5, 2018

Area of Science:

Optical Sensing
Acoustic Metrology
Biomedical Imaging

Background:

Conventional ultrasonic transducers have limitations in signal-to-noise ratio (SNR) and spectral range.
Previous multi-bounce laser microphone systems were limited to frequencies below 10 kHz for detecting acoustic signatures.

Purpose of the Study:

To demonstrate the feasibility of the multi-bounce laser microphone for biomedical ultrasound imaging.
To evaluate its performance in detecting ultrasound waves at higher frequencies.
To compare its sensitivity with existing optical hydrophones.

Main Methods:

Utilizing an all-optical sensing technique with a gold-covered thin film diaphragm.
Employing multiple light bounces to amplify signal strength and enhance real-time SNR.
Conducting experiments to detect ultrasound waves from 100 kHz to over 1 MHz.
Testing photoacoustic signature detection from India ink using a LED excitation source.

Main Results:

High-fidelity detection of ultrasound waves demonstrated in the 100 kHz to >1 MHz range.
Improved detection sensitivity compared to a commercial Fabry-Perot optical hydrophone.
Successful detection of photoacoustic signatures without signal averaging.

Conclusions:

The multi-bounce laser microphone shows significant potential for advanced ultrasound imaging applications.
The technique offers enhanced SNR and broader spectral detection capabilities.
It provides a sensitive, real-time, all-optical solution for ultrasound detection.