未来定制听觉系统仿生柔性压电声学传感器的理论基础,Advanced Functional Materials

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未来定制听觉系统仿生柔性压电声学传感器的理论基础
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-12-06 , DOI: 10.1002/adfm.202309316
Young Hoon Jung ₁ , Jaehun An ₁ , Dong Yeol Hyeon ₁ , Hee Seung Wang ₁ , Ingon Kim ₂ , Chang Kyu Jeong ₃ , Kwi‐Il Park ₄ , Pooi See Lee ₅ , Keon Jae Lee ₁

Affiliation

通过从无所不在的生物力学输入中获取高质量数据，柔性压电传感器已成为重要的人机界面 (HMI)。由于人声是其中最直观的生物信号，因此柔性压电声学传感器 (f-PAS) 有可能改变 HMI 技术的范式。尽管f-PAS具有高灵敏度和说话人识别精度等出色的性能，但由于其传感原理与商业化麦克风有根本不同，f-PAS的理论研究还不足以实现未来的定制开发。在此，介绍了利用机械和电气物理的自供电 f-PAS 的理论框架。首先，将f-PAS的基本理论与人类耳蜗的听觉系统进行了比较。基于仿生梯形形状，分析了各种结构和材料条件下的谐振频率。此外，还导出了 f-PAS 的压电性，以在实验前预测灵敏度和 SNR。为了研究类似于人耳的介质条件下的传感器特性，从理论上比较了取决于物质状态的声学响应。最后，通过压电与声压之间的相关性研究了f-PAS的距离极限，这将为f-PAS的未来应用提供新的功能材料设计策略。

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Theoretical Basis of Biomimetic Flexible Piezoelectric Acoustic Sensors for Future Customized Auditory Systems

Flexible piezoelectric sensors have been spotlighted as an essential human–machine interface (HMI) by obtaining high-quality data from omnipresent biomechanical inputs. Because human voice is the most intuitive bio-signal among them, flexible piezoelectric acoustic sensors (f-PAS) have a potential to shift the paradigm of HMI technologies. Despite the reported outstanding performance such as high sensitivity and speaker recognition accuracy, the theoretical investigation of f-PAS has been insufficient to realize future customized development, because sensing principles are fundamentally different from commercialized microphones. Here, a theoretical framework of self-powered f-PAS by using mechanical and electrical physics is introduced. First of all, the basic theory of f-PAS is compared with the auditory system of human cochlear. Based on the biomimetic trapezoidal shape, the resonant frequencies are analyzed with various structural and material conditions. In addition, the piezoelectricity of f-PAS is derived to predict the sensitivity and SNR prior to experiments. To investigate sensor properties under the medium condition that is similar to human ear, the acoustic responses depending on the states of matter are theoretically compared. Finally, the distance limit of f-PAS is studied with the correlations between piezoelectricity and sound pressure, which would provide novel strategies of functional material design for future applications of f-PAS.

更新日期：2023-12-06

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