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ScAlN PMUTs Based on Flexurally Suspended Membrane for Long-Range Detection.

Shutao Yao1,2, Wenling Shang1,3, Guifeng Ta2

  • 1Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

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Summary

Researchers developed a new scandium-doped aluminum nitride (ScAlN) piezoelectric micromachined ultrasonic transducer (PMUT) for enhanced distance sensing. This novel PMUT design achieves a record 11.2m sensing range, crucial for miniature robots.

Keywords:
flexurally suspended membranelong-range target detectionpiezoelectric micromachined ultrasonic transducer (PMUT)scandium-doped aluminum nitride (ScAlN)

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Area of Science:

  • Materials Science
  • Microelectromechanical Systems (MEMS)
  • Acoustics

Background:

  • Piezoelectric micromachined ultrasonic transducers (PMUTs) are vital for distance sensing.
  • Miniature robots require enhanced ranging capabilities for operation in complex environments.
  • Improving PMUT sensing distance is critical for advanced robotic applications.

Purpose of the Study:

  • To propose and investigate a novel scandium-doped aluminum nitride (ScAlN) PMUT.
  • To enhance the sensing distance of PMUTs for miniature robotic applications.
  • To explore the performance of a flexurally suspended, partially clamped membrane design.

Main Methods:

  • Fabrication of a ScAlN PMUT with a flexurally suspended, partially clamped membrane.
  • Characterization of the PMUT's acoustic performance, including sound pressure level (SPL) and receiving sensitivity.
  • Distance sensing tests using the PMUT, with and without an acoustic horn.

Main Results:

  • The ScAlN PMUT operates at a resonant frequency of 78 kHz.
  • A single PMUT achieved a sound pressure level (SPL) of 112.2 dB at 10 mm and a receiving sensitivity of 12.3 mV/Pa.
  • The PMUT equipped with a horn demonstrated a record-breaking distance sensing range of 11.2 m.

Conclusions:

  • The proposed ScAlN PMUT with a partially clamped membrane design significantly enhances vibration displacement and output sound pressure.
  • This novel PMUT achieves unprecedented long-range distance sensing capabilities.
  • The findings are highly significant for miniaturized and integrated ultrasound-based long-range target detection systems.