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Surface Condition Sensing With Broadband and Highly Directional PMUT Array.

Junhao Wang, Jiao Xia, Aocheng Bao

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|August 22, 2025

Summary

This summary is machine-generated.

This study introduces a Piezoelectric Micromachined Ultrasonic Transducer (PMUT) array for advanced material analysis. The ultra-wide bandwidth PMUT array enables precise detection of ultrasound propagation attenuation coefficients in various media.

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Area of Science:

Materials Science
Acoustics
Sensor Technology

Background:

Ultrasound propagation attenuation coefficient detection is crucial for differentiating materials.
Multi-frequency ultrasound requires broad bandwidth transducers, posing a technical challenge.

Purpose of the Study:

To develop an ultra-wide bandwidth Piezoelectric Micromachined Ultrasonic Transducer (PMUT) array.
To demonstrate its capability in detecting ultrasound attenuation coefficients for material characterization.

Main Methods:

Integration of multiple frequency elements within a PMUT array with optimized spacing.
Achieving fused vibration modes for enhanced bandwidth performance.
Optimizing array size relative to wavelength for acoustic beam directivity.

Main Results:

Achieved -6 dB emission fractional bandwidth of 230% and pulse-echo fractional bandwidth of 146%.
Demonstrated a highly directional 5° acoustic beam for effective penetration.
Correlated attenuation coefficients in ice and liquid with material properties.

Conclusions:

The developed PMUT array offers ultra-wide bandwidth and directional acoustic beams.
It shows significant potential for identifying and analyzing surface media.
Promising applications in power systems, transportation, and industrial production.