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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Published on: May 11, 2014

Acoustic Fabry-Perot Resonance Detector for Passive Acoustic Thermometry and Sound Source Localization.

Yan Yue^1,2, Zhifei Dong^1,2, Zhi-Mei Qi^1,2,3

¹State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

Sensors (Basel, Switzerland)

|April 26, 2025

Summary

Researchers developed a novel acoustic sensor array for simultaneous acoustic temperature measurement and sound source localization. This innovative device enhances microphone sensitivity using the Fabry-Perot resonance effect, enabling accurate environmental monitoring.

Keywords:

acoustic Fabry-Perot resonance detector (AFPRD)acoustic temperature measurement (ATM)sound source localization (SSL)

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Area of Science:

Acoustic sensing
Sensor technology
Signal processing

Background:

Acoustic temperature measurement (ATM) and sound source localization (SSL) are critical applications for acoustic sensors.
Developing novel sensors for combined ATM and SSL presents an innovative research opportunity.

Purpose of the Study:

To design, fabricate, and validate an acoustic Fabry-Perot resonance detector (AFPRD) and its array for passive ATM and active SSL.
To enhance microphone sensitivity and enable accurate environmental parameter determination.

Main Methods:

Designed an AFPRD using an acoustic waveguide and microphone to leverage the Fabry-Perot resonance effect.
Fabricated a cross-shaped AFPRD array with bent acoustic waveguides for expanded aperture.
Employed the multiple signal classification (MUSIC) algorithm for sound source localization, incorporating real-time sound speed measurements.

Main Results:

The AFPRD demonstrated passive ATM with accuracy up to 0.4 °C using ambient white noise as low as 17 dB.
The AFPRD array achieved SSL with an error less than 1.2° for acoustic targets at 35 mPa in outdoor environments.
Simulations and experimental verifications confirmed the ATM and SSL capabilities of the developed system.

Conclusions:

The developed AFPRD and its array offer a novel solution for multifunctional acoustic detection.
This technology opens new possibilities for advanced acoustic sensing devices and systems.
The findings highlight the potential for enhanced sensitivity and accuracy in acoustic measurement and localization.