基于霍尔传感器微阵列的呼吸频率检测系统设计

Design of respiratory frequency detecting system based on Hall sensor micro-array

基于呼吸感应体积描记技术原理,在一条腹带内部嵌入了永磁铁,腹带系在患者腰部,在呼吸过程中,由于体积的变化引起腹带中永磁铁的位置运动,通过霍尔传感器阵列对永磁铁位置进行检测,从而判断呼气和吸气的过程,采用单片机对传感器信号进行分析处理,计算出呼吸频率。经10名受试者重复实验,并与呼吸检测设备的检测结果进行比较,本系统的平均精确度高于95%,证明了本系统的可靠性。所设计的呼吸频率检测系统可用于睡眠呼吸检测仪、慢呼吸高血压治疗仪等设备。

A respiration frequency detecting system is proposed based on respiratory inductive plethysmograph technology.When the bellyband of the system is tied to the waist of the subject,the abdomen volume change during respiration can cause the position motion of the permanent magnet embedded in the bellyband,and Hall sensor array can detect the position of the magnet,and then the process of Expiration and inspiration is determined.The sensor signal is analyzed and processed by MCU,and then the respiratory frequency is calculated.Experiments on 10 subjects are repeated,and the results are compared with those of the respiration detection equipment.Results indicate that the average accuracy of the designed system is above 95 %,which verifies the reliability of this system.The designed respiratory frequency detecting system can be applied to sleeping respiratory detecting instruments and slow-respiration hypertension therapeutic equipment,and so on.