Mutual capacitance of liquid conductors in deformable tactile sensing arrays
Mutual capacitance of liquid conductors in deformable tactile sensing arrays
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DOI：
10.1063/1.4939620
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发表时间：
2016-01-04
影响因子：
4
通讯作者：
Visell, Yon
中科院分区：
文献类型：
--
作者：
Li, Bin;Fontecchio, Adam K.;Visell, Yon
需要在高度可变形电子器件方面取得进展，以实现从可穿戴电子器件到医疗设备和软机器人组件的新兴类别的软计算设备。高弹性基底与固有可拉伸导体的组合有望实现电子传感器，其可以符合弯曲物体，可重新配置的显示器或软生物组织，包括皮肤。在这里，我们有助于触觉（机械图像）传感器的基础上非常低模量的聚合物基板嵌入式液态金属微流体阵列的传感原理。该传感器是使用一个单一的步骤铸造方法，利用细尼龙长丝生产阵列的圆柱形通道上的两层。填充这些通道的液态金属（镓铟合金）导体容易采用包埋膜的形状，由于使用软聚合物基底，产生大于400%的变形性水平。我们建模的传感器性能，静电理论和连续介质力学，产生良好的协议与实验。使用矩阵寻址电容测量技术，我们能够解决应变分布与毫米分辨率超过几平方厘米的面积。(C)2016 AIP Publishing LLC.
Advances in highly deformable electronics are needed in order to enable emerging categories of soft computing devices ranging from wearable electronics, to medical devices, and soft robotic components. The combination of highly elastic substrates with intrinsically stretchable conductors holds the promise of enabling electronic sensors that can conform to curved objects, reconfigurable displays, or soft biological tissues, including the skin. Here, we contribute sensing principles for tactile (mechanical image) sensors based on very low modulus polymer substrates with embedded liquid metal microfluidic arrays. The sensors are fabricated using a single-step casting method that utilizes fine nylon filaments to produce arrays of cylindrical channels on two layers. The liquid metal (gallium indium alloy) conductors that fill these channels readily adopt the shape of the embedding membrane, yielding levels of deformability greater than 400%, due to the use of soft polymer substrates. We modeled the sensor performance using electrostatic theory and continuum mechanics, yielding excellent agreement with experiments. Using a matrix-addressed capacitance measurement technique, we are able to resolve strain distributions with millimeter resolution over areas of several square centimeters. (C) 2016 AIP Publishing LLC.