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    Researchers developed a novel piezopolymer ultrasonic sensor inspired by bat biosonar. This spiral-shaped polyvinylidene fluoride transducer effectively transmits and receives signals across a wide frequency range, offering omnidirectional properties.

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    Area of Science:

    • Biomimetics
    • Materials Science
    • Acoustics

    Background:

    • Low-frequency ultrasonic transducers often draw inspiration from biological systems like dolphin and bat biosonar.
    • Existing technologies have limitations in covering the broad frequency range utilized by bats.

    Purpose of the Study:

    • To investigate the feasibility of a piezopolymer sensor for bat biosonar frequencies.
    • To develop a broadband ultrasonic sensor mimicking biological models.

    Main Methods:

    • Fabrication of a polyvinylidene fluoride (PVDF) sensor with a logarithmic spiral geometry, inspired by the cochlea.
    • Experimental transmission and reception tests.
    • Finite element analysis for resonant frequency evaluation.

    Main Results:

    • The spiral transducer successfully transmitted and received ultrasonic signals between 20 and 80 kHz, matching bat vocalizations.
    • Experimental and finite element analysis results for resonant frequencies showed strong agreement.
    • Transmission sound pressure level reached 90 dB; reception sensitivity ranged from -103.8 to -89.1 dB.
    • Demonstrated omnidirectional properties in both horizontal and vertical planes.

    Conclusions:

    • A novel spiral-shaped PVDF ultrasonic sensor can effectively cover the wide frequency range of bat biosonar.
    • The biomimetic design offers a breakthrough in broadband ultrasonic sensor technology with omnidirectional capabilities.