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Characterization and Modeling of Humidity-dependence of IPMC Sensing Dynamics

机译：IPMC传感动力学的湿度相关性表征和建模

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Ionic polymer-metal composites (IPMCs) have intrinsic actuation and sensing capabilities, and they need hydra-tion to operate. For an IPMC sensor operating in air, the water content in the polymer varies with the humidity level of the ambient environment, which leads to its strong humidity-dependent sensing behavior. However, the study of this behavior has been very limited. In this paper, the influence of environmental humidity on IPMC sensors is characterized and modeled from a physical perspective. Specifically, a cantilevered IPMC beam is excited mechanically at its base inside a custom-built humidity chamber, where the humidity is feedback-controlled by activating/deactivating a humidifier or a dehumidifier properly. We first obtain the empirical frequency responses of the sensor under different humidity levels, with the IPMC base displacement as input and the tip displacement and short-circuit current as outputs. Based on physics-based model for a given humidity level, we then curve-fit the measured frequency responses to identify the humidity-dependent physical parameters, including Young's modulus and strain-rate damping coefficient for the mechanical properties, and ionic diffusivity for the mechanoelectrical dynamics. These parameters show a clear trend of change with the humidity. By fitting the identified parameters at a set of test humidity levels, the humidity-dependence of the physical parameters is captured with polynomial functions, which are then plugged into the physics-based model for IPMC sensors to predict the sensing output under other humidity conditions. The latter humidity-dependent model is further validated with experiments.
机译：离子聚合物金属复合材料（IPMC）具有内在的驱动和传感功能，并且需要水合作用。对于在空气中运行的IPMC传感器，聚合物中的水分含量会随着周围环境的湿度水平而变化，这导致其强烈的湿度相关感测行为。但是，对这种行为的研究非常有限。本文从物理角度对环境湿度对IPMC传感器的影响进行了表征和建模。具体而言，悬臂式IPMC光束在定制的湿度室内部的底部被机械激发，在该湿度中，通过适当地启动/关闭加湿器或除湿器来对湿度进行反馈控制。我们首先获得不同湿度水平下传感器的经验频率响应，以IPMC基本位移为输入，尖端位移和短路电流为输出。对于给定的湿度水平，基于物理模型，然后对所测得的频率响应进行曲线拟合，以确定与湿度有关的物理参数，包括机械性能的杨氏模量和应变率阻尼系数，以及机电的离子扩散率。动力学。这些参数显示出明显的湿度变化趋势。通过将识别出的参数拟合到一组测试湿度水平，可以利用多项式函数捕获物理参数的湿度依赖性，然后将其插入IPMC传感器的基于物理的模型中，以预测其他湿度条件下的传感输出。通过实验进一步验证了后者与湿度有关的模型。

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