【摘要】 针对人体呼吸特征监测,设计了基于氧化石墨烯(GO)的石英晶体微天平(QCM)呼吸传感器以及传感系统。传感器位于鼻子与上唇之间,通过监测呼吸导致的湿度变化来监测人体呼吸特征。通过研究GO敏感膜厚度对传感性能的影响,使QCM传感器对湿度变化的响应和恢复时间可分别缩短到0.4 s和1.2 s,满足了呼吸监测的快速响应、恢复速度要求。传感系统可监测呼吸的发生时间和强度,可测量的呼吸频率大于27次/min,高于成人呼吸频率(约16～20次/min),可用于实际的人体呼吸监测。更多还原

【Abstract】 For monitoring human respiratory characteristics,a quartz crystal microbalance(QCM)respiratory sensor and sensing system based on graphene oxide(GO) were designed.The sensor,which is located between the nose and the upper lip,monitored human’s breathing by monitoring the humidity change caused by breathing.By investigating the effect of GO film thickness on sensing performance,the response and recovery time of QCM sensor to humidity change can be shortened to 0.4 s and 1.2 s,respectively,which met the requirements of respiratory monitoring on response/recovery speed.The sensing system can monitor the occurrence time and intensity of respiration,and the measurable respiratory frequency is more than 27 times/min,higher than the adult respiratory frequency(about 16～20 times/min).Therefore,the sensing system can be used for the actual human respiratory monitoring.更多还原