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Respiration Monitoring Using a Flexible Paper-Based Capacitive Sensor

机译：使用基于纸张的柔性电容式传感器进行呼吸监测

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Respiration is a key vital sign indicative of an individual's health. Current approaches of respiration sensing require direct contact with the body. Moreover, they are expensive and need bulky holter monitors for continuous realtime monitoring. In this study, we propose a low-cost capacitive sensor fabricated using screen printing of carbon paste interdigitated electrodes on paper substrate for respiration monitoring. Cellulosic paper provides a microporous network to trap exhaled breath. Respiration causes the dielectric constant of the paper to change, mostly as a function of breath humidity, which in turn changes the capacitance of the sensor. The interdigitated electrodes configuration is shown to provide better response time compared to resistive configuration. A simple phase sensitive detector-based circuit was used to convert the capacitance change into a measurable output voltage. The MSP430 microcontroller was used for data acquisition and voltage measurement. A graphical user interface was designed for real time respiration monitoring. Experimental results validate the performance of this sensor.
机译：呼吸是指示个人健康的关键生命体征。当前的呼吸感测方法需要与身体直接接触。此外，它们很昂贵，并且需要笨重的动态心电图监测仪来进行连续的实时监测。在这项研究中，我们提出了一种低成本的电容式传感器，该传感器是通过在纸质基材上丝网印刷碳糊指状电极制成的，用于呼吸监测。纤维素纸提供了微孔网络来捕获呼气。呼吸会使纸张的介电常数发生变化，这主要是作为呼吸湿度的函数，从而改变传感器的电容。所示的叉指电极配置与电阻配置相比可提供更好的响应时间。一个简单的基于相敏检测器的电路被用于将电容变化转换为可测量的输出电压。 MSP430微控制器用于数据采集和电压测量。图形用户界面设计用于实时呼吸监控。实验结果验证了该传感器的性能。

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