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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.
Micromachines
|November 27, 2024
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.
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.
