基于PVDF传感器和LoRa的远程呼吸监测系统

Remote respiratory monitoring system based on PVDF sensor and LoRa

文中设计一种基于PVDF传感器和LoRa无线通信模块的远程呼吸监测系统,旨在为阻塞性睡眠呼吸暂停低通气综合征(OSAHS)患者提供高效、准确的远程监控解决方案。该系统利用PVDF传感器采集呼吸信号,通过放大与滤波电路对其进行处理,并利用LoRa技术实现对处理后的呼吸信号进行远程传输与监测。为扩大远程呼吸监测系统的通信范围,引入一级中继设备,并提出新型的信道资源分配规则和扩频因子分配算法,以提高无线通信信道的利用率,增加病人的支持数量。文中首次提出一级中继设备扩频因子的约束条件和中继设备的替代性指数,以优化远程呼吸监测系统的设计过程。通过呼吸信号采集测试验证文中提出的呼吸信号采集放大电路的功能,根据通信测试验证文中提出的网络结构以及搭建网络结构的方法。测试结果验证了系统的有效性,并展示了其在医疗监控领域的应用潜力。

A remote respiratory monitoring system based on PVDF(polyvinylidene fluoride)sensors and LoRa wireless communication modules is studied.The system aims to provide efficient and accurate remote monitoring solutions for patients with obstructive sleep apnea⁃hypopnea syndrome(OSAHS).In the system,the PVDF sensors are utilized to collect respiratory signals,which are processed with amplification and filtering circuits.And then,the LoRa technology is used for remote transmission and monitoring of the processed respiratory signals.To expand the communication range of the remote respiratory monitoring system,primary relay devices are introduced,along with new channel resource allocation rules and spread spectrum factor allocation algorithm,so as to improve the utilization of wireless communication channels and increase the number of supported patients.In this study,constraints on the spread spectrum factor of primary relay devices and an index of substitutability for relay devices are introduced for optimizing the design process of the remote respiratory monitoring system.The functionality of the proposed respiratory signal collection and amplification circuit in this study has been verified by the respiratory signal collection testing.The proposed network structure and the method of building the network structure have been verified by the communication testing.The results of the above testing have validated the effectiveness of the proposed system and demonstrated the application potentiality of the system in the field of medical monitoring.