基于磁感应的呼吸信号测量的可行性实验

基于磁感应测量生物阻抗变化的原理,提出了一种通过测量胸腔电导率变化来检测呼吸信号的方法.首先根据呼吸运动的特点,假定人体胸腔为电导率均匀的球体,建立磁感应测量呼吸信号的理论模型;通过仿真研究,分析阻抗与胸腔容积变化的关系,以及线圈传感器半径对测量结果的影响;最后通过实验研究探讨线圈传感器参数、盐溶液电导率和容积、测量距离、呼吸行为对测量电路的影响.实验结果表明,基于磁感应的呼吸信号测量为非接触式、长期的呼吸信号测量提供一种解决方案,具有进一步研究价值.

Feasibility Experiment of Respiratory Signal Measurement Based on Magnetic Induction

According to the principle of measuring bioelectrical impedance changes based on magnetic induction， a method was proposed to test the respiratory signal by measuring the change of conductivity in chest. Supposing the thorax as a uniform conductivity sphere， a measuring respiratory signal theoretical model was developed based on the motion characteristics. Some simulations were implemented to analyze the relationship between the thoracic impedance and volume variation， as well as the effect of sensor coil radius on the measurement results. At last， the testing experiments was carried out to discuss the effects of the coil sensor parameters， the conductivity and volume of the NaCl liquid， measuring distance and respiration motion on the measurement circuit. The results showed that the respiratory signal measurement based on magnetic induction will be one of the effective solutions for non-contact， long-term respiratory signal detection and has further research value.