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首页> 外文期刊>Sensors Journal, IEEE >Elastomeric Ionic Hydrogel Sensor for Large Strains
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Elastomeric Ionic Hydrogel Sensor for Large Strains

机译：大型菌株的弹性离子水凝胶传感器

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摘要

An elastomeric hydrogel membrane containing dissolved salt is demonstrated to be a linear strain sensor for large strains up to 25%. AC sensing circuitry allows the ionic conductor to function as a sensor without polarization effects. The homogeneous gel is shown to be lacking a relaxation or hysteresis response found in the soft composite piezoresistors that are commonly used for large strain sensing. This allows operation of the sensor with minimal post-processing and increased accuracy during real-time operation. The gauge factor of the gel sensor is shown to be near two, consistent with the observation that the strain sensing of the material is solely derived from the deformation of the bulk. The very low Young's modulus of the gel (~1 kPa) allows deformation of a fabric substrate to be followed without significantly constraining the fabric. A prototype sleeve that uses these sensors for proprioceptive sensing of joint angle motion on a robotic arm is demonstrated as a potential application. Water loss from the hydrogel due to evaporation from the surface is slow. We show that the resulting trend in the impedance of the sensor can be easily corrected by simple signal processing.
机译：含有溶解盐的弹性水凝胶膜被证明是线性应变传感器，适用于高达25％的大应变。交流感测电路允许离子导体充当无极化效应的传感器。均匀的凝胶显示缺乏松弛或滞后响应，而这种响应在通常用于大应变传感的软复合压敏电阻器中发现。这使传感器的操作具有最少的后处理能力，并在实时操作中提高了准确性。凝胶传感器的规格因子显示为接近2，这与观察到的材料的应变感测仅源自块体的变形是一致的。极低的凝胶杨氏模量（〜1 kPa）允许跟随织物基材的变形而不会显着限制织物。使用这些传感器对机器人手臂上的关节角运动进行本体感受的原型套筒已被证明是一种潜在的应用。由于从表面蒸发，水凝胶中的水损失缓慢。我们表明，通过简单的信号处理可以很容易地校正传感器阻抗的最终趋势。

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