Frequency-selective acoustic sensing using circular PVDF-based artificial basilar membranes

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI:10.1016/j.sna.2025.116633

Behrouz Aghajanloo, Sajad A. Moshizi, Mohsen Asadnia, Christopher Pastras

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Abstract

Understanding and replicating the natural frequency selectivity of the cochlea is critical for advancing hearing devices and biomimetic acoustic sensors. This study presents a circular artificial basilar membrane (CABM) as a piezoelectric acoustic sensor inspired by the tonotopic frequency selectivity of the basilar membrane in the cochlea. The sensor integrates four distinct PVDF thin films into a single robust platform, enabling simultaneous multi-frequency detection. The sensor operates across a biologically relevant frequency range of 100–3000 Hz, covering essential human speech and environmental sound frequencies. A major challenge in biomimetic acoustic sensing is achieving frequency selectivity while maintaining a conformal and scalable design. This study addresses this by optimizing membrane geometry, device design, and experimental configurations. Additionally, minimizing wave reflection, diffraction, and entrapment effects required systematic optimization of sensor positioning and testing conditions. This research integrates analytical modeling, numerical simulations, and experimental validation to investigate membrane dynamics. Resonance frequencies were derived using acoustic principles, refined through Finite Element Method (FEM) simulations, and validated via Laser Doppler Vibrometry (LDV). The effects of membrane diameter, sound intensity, source distance, and sound direction were analyzed to characterize sensor behavior. The successful integration of the four-channel CABM system, mimicking the cochlea’s tonotopic behavior, marks a step forward in artificial cochlear devices. This work demonstrates a scalable and compact solution for multi-frequency acoustic sensing, with potential applications in cochlear implants, speech recognition, and bio-inspired auditory systems.

查看原文本刊更多论文

基于圆形pvdf人造基底膜的频率选择性声传感

了解和复制耳蜗的固有频率选择性对于推进听力设备和仿生声学传感器至关重要。本研究提出了一种圆形人工基底膜（CABM）作为压电声传感器，灵感来自于耳蜗基底膜的张力异位频率选择性。该传感器将四种不同的PVDF薄膜集成到一个强大的平台中，可以同时进行多频率检测。该传感器工作在100-3000 Hz的生物相关频率范围内，涵盖基本的人类语音和环境声音频率。仿生声学传感的一个主要挑战是在保持保形和可扩展设计的同时实现频率选择性。本研究通过优化膜的几何形状、装置设计和实验配置来解决这个问题。此外，最小化波反射、衍射和夹带效应需要系统地优化传感器定位和测试条件。本研究结合分析模型、数值模拟和实验验证来研究膜动力学。根据声学原理推导出共振频率，通过有限元法（FEM）模拟进行细化，并通过激光多普勒振动仪（LDV）进行验证。分析了膜直径、声强、声源距离和声方向对传感器性能的影响。四通道CABM系统的成功集成，模拟了耳蜗的异位行为，标志着人工耳蜗装置向前迈进了一步。这项工作展示了一种可扩展的、紧凑的多频声传感解决方案，在人工耳蜗植入、语音识别和仿生听觉系统中具有潜在的应用前景。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...