• 基于柔性印刷电路的传感器电路设计及手势识别应用

    Circuit design and gesture recognition applications of sensors based on flexible printed circuits

    • 针对传统摩擦电传感阵列在可穿戴应用中存在的引线冗余、模拟信号易受干扰及系统集成度不足等问题,本文提出一种基于柔性印刷电路(Flexible Printed Circuit, FPC)的可穿戴式摩擦电阵列智能交互系统。采用阳极氧化铝模板热压工艺,在尼龙摩擦层表面构筑微纳圆锥结构,以提升器件的接触起电效率;同时,将传感单元、前端信号调理、模数转换与无线传输模块集成于FPC上,缩短模拟信号传输路径,实现多通道信号的近端数字化采集,从而降低长距离传输过程中的信号衰减与干扰风险。系统结合一维卷积神经网络(One-Dimensional ConvolutionalNeural Network, 1D-CNN)与多层感知机(Multilayer Perceptron, MLP)模型,对五路摩擦电信号的时序特征进行提取与分类,实现物体形状与手势指令的识别,准确率分别达到94.2%和90.0%。在此基础上,本文构建了人机闭环交互平台,实现对远程无人载具的实时控制,为高集成度、自供电柔性交互系统的设计提供了一种可行方案。

       

      Abstract: To address the issues of redundant wiring, susceptibility of analog signals to interference, and insufficient system integration density in conventional triboelectric sensing arrays for wearable applications, this paper proposes a wearable intelligent interactive system based on a flexible printed circuit (FPC)-integrated triboelectric array. Micro/nano conical structures are fabricated on the surface of a nylon friction layer using an anodized aluminum oxide template hot-pressing process to enhance the contact electrification efficiency of the device. Meanwhile, the sensing units, front-end signal conditioning circuitry, analog-to-digital conversion, and wireless transmission modules are all integrated onto the FPC, shortening the analog signal transmission paths and enabling near-sensor digitization of multi-channel signals, thereby reducing signal attenuation and interference risks during long-distance transmission. The system employs a one-dimensional convolutional neural network (1D-CNN) combined with a multilayer perceptron (MLP) model to extract and classify the temporal features of five-channel triboelectric signals, achieving recognition accuracies of 94.2% for object shapes and 90.0% for gesture commands. Based on this, a closed-loop human–machine interaction platform is constructed to enable real-time control of remote unmanned vehicles, providing a feasible solution for the design of highly integrated, self-powered flexible interactive systems.

       

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