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Sound-focusing package for MEMS vector hydrophone.

Zhiyuan Cheng1, Guojun Zhang2, Zhengyu Bai1

  • 1State Key Laboratory of Dynamic Testing Technology, North University of China, Taiyuan, China.

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This study introduces a novel sound-focusing package for Micro-Electro-Mechanical Systems (MEMS) vector hydrophones, significantly improving sensitivity and directivity. The design effectively enhances underwater acoustic detection performance within the low-frequency band.

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Area of Science:

  • Acoustics and Signal Processing
  • Materials Science
  • Micro-Electro-Mechanical Systems (MEMS)

Background:

  • Traditional Micro-Electro-Mechanical Systems (MEMS) vector hydrophone packaging faces challenges with acoustic wave attenuation.
  • Existing packaging solutions often compromise sensitivity and directivity in underwater acoustic detection.

Purpose of the Study:

  • To develop and validate a novel sound-focusing package for MEMS vector hydrophones.
  • To enhance acoustic energy concentration and improve hydrophone performance metrics like sensitivity and directivity.

Main Methods:

  • Theoretical analysis and COMSOL simulations were employed to design a sound-focusing package with tapered apertures (TA) and a nylon sound-focusing cap (NSC).
  • Experimental validation using standing wave tube tests assessed the performance of the NSC-encapsulated hydrophone.
  • Comparison with steel mesh sound-transmitting cap (SMC) and non-encapsulated bare cilia (NC) configurations.

Main Results:

  • The NSC achieved a sensitivity of -186.4 dB at 100 Hz, outperforming SMC and NC by 7.9 dB and 6.1 dB, respectively.
  • Directivity null depth reached 40.98 dB at 315 Hz, exceeding SMC and NC by 7.35 dB and 5.49 dB.
  • Nylon material's properties ensured a natural frequency above the operating band (20-500 Hz), preventing resonance and maintaining high signal-to-noise ratio.

Conclusions:

  • The proposed sound-focusing package with tapered apertures and a nylon sound-focusing cap effectively addresses acoustic wave attenuation in MEMS vector hydrophones.
  • This innovative design offers a significant improvement in sensitivity and directivity for low-frequency underwater acoustic detection.
  • The study validates the sound-focusing package as a viable solution for high-performance underwater acoustic sensing applications.