【摘要】 针对市场上缺乏尿湿检测有效装置的问题,提出了一种基于非接触式电容检测湿度的方法。设计了一个简单的RC充放电低成本电路,通过观测在无尿湿情况和有尿湿情况下电容容值的变化,依靠硬件抗干扰设计和软件自适应滤波算法,能够准确判断是否有尿湿发生。理论分析和计算机仿真结果表明,该方法能有效监测婴幼儿、老年人的尿湿状况,还可以滤除环境变化对微小电容容值的影响。更多还原

【Abstract】 Considering the lacking of effective detection devices for urinary humidity in the market,this paper proposes a novel non-contact detection method with capacitive sensor. It designs a simple and low-cost RC charge-discharge circuit. Observing the changing capactive value respectively when no urinary happens and when urinary happens, we can tell exactly whether it happened or not, with the aid of hardware anti-interference techniques and software adaptive filtering algorithm. Theoretical analysis and simulation results validate that the proposed method can effectively monitor the urinary state for babies as well as the elderly, and it can elimate the environmental influence on low capacitance.更多还原