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A Microfluidic, Reversibly Stretch able, Large-Area Wireless Strain Sensor

机译：微流可逆拉伸的大面积无线应变传感器

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摘要

This article describes the implementation and characterization of a new self-contained large-area wireless strain sensor, operating around 1.5 GHz, based on the concept of multi-layer microfluidic stretchable radiofrequency electronics (μFSRFEs). Compared to existing solutions, the presented integrated strain sensor is capable of remotely detecting repeated high tensile dynamic strains of up to 15% over very large surfaces or movable parts, and gets rid of all hardwiring to external storage or data processing equipment. Unlike conventional electronic devices, the major part of the sensor is a mechanically reconfigurable and reversibly deformable patch antenna, which consists of two layers of liquid metal alloy filled microfluidic channels in a silicone elastomer. A simplified radiofrequency (RF) transmitter composed of miniaturized rigid active integrated circuits (ICs) associated with discrete passive components was assembled on a flexible printed circuit board (FPCB) and then heterogeneously integrated to the antenna. The elastic patch antenna can withstand repeated mechanical stretches while still maintaining its electrical function to some extent, and return to its original state after removal of the stress. Additionally, its electrical characteristics at frequency of operation are highly sensitive to mechanical strains. Consequently, not only is this antenna a radiator for transmitting and receiving RF signals like any other conventional antennas, but also acts as a reversible large-area strain sensor in the integrated device. Good electrical performance of the standalone antenna and the RF transmitter sub-module was respectively verified by experiments. Furthermore, a personal computer (PC)-assisted RF receiver for receiving and processing the measured data was also designed, implemented, and evaluated. In the real-life demonstration, the integrated strain sensor successfully monitored periodically repeated human body motion, and wirelessly transmitted the measured data to the custom-designed receiver at a distance of 5m in real-time.
机译：本文基于多层微流体可伸展射频电子（μFSRFE）的概念，描述了一种新的独立式大面积无线应变传感器的实现和特性，该传感器工作在1.5 GHz左右。与现有解决方案相比，本发明的集成应变传感器能够远程检测非常大的表面或可移动部件上高达15％的重复高拉伸动态应变，并且消除了到外部存储或数据处理设备的所有硬接线。与传统的电子设备不同，传感器的主要部分是可机械重构和可逆变形的贴片天线，该贴片天线由两层液态金属合金填充的有机硅弹性体中的微流体通道组成。由与离散无源元件相关的微型刚性有源集成电路（IC）组成的简化射频（RF）发射器组装在柔性印刷电路板（FPCB）上，然后异构集成到天线中。弹性贴片天线可以承受重复的机械拉伸，同时仍在一定程度上保持其电功能，并且在去除应力后恢复其原始状态。另外，其在工作频率下的电特性对机械应变高度敏感。因此，该天线不仅像其他任何常规天线一样都是用于发射和接收RF信号的辐射器，而且还充当集成设备中的可逆大面积应变传感器。实验分别验证了独立天线和RF发射器子模块的良好电性能。此外，还设计，实现和评估了用于接收和处理测量数据的个人计算机（PC）辅助RF接收器。在现实生活中的演示中，集成应变传感器成功地监视了人体的周期性重复运动，并将测量到的数据实时无线传输到距离5m的定制设计接收器。

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  • 来源
    《Advanced Functional Materials》 |2011年第12期|p.2282-2290|共9页
  • 作者

    Shi Cheng; Zhigang Wu;

  • 作者单位

    Advanced Technology Laird Technologies Box 1146, Kista, 16422, Sweden;

    Department of Engineering Sciences Uppsala University Box 543, The Angstrom Laboratory Uppsala, 75121, Sweden;

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