基于NB-IoT的室外环境空气质量在线监测系统设计  

Design of Outdoor Air Quality Online Monitoring System Based on NB-IoT

作　　者：董莹 孙拥军 DONG Ying;SUN Yongjun(Shandong Weifang Eco-environment Monitoring Center,Weifang 261041,China;Weifang Industrial Development Promotion Center,Weifang 261041,China)

机构地区：[1]山东省潍坊生态环境监测中心,山东潍坊261041 [2]潍坊市工业发展促进中心,山东潍坊261041

出　　处：《计算机测量与控制》2023年第2期28-33,共6页Computer Measurement &Control

摘　　要：为精准计量污染性气体在室外环境中的浓度水平,实现对室外环境空气质量的准确监测,设计基于NB-IoT的室外环境空气质量在线监测系统;利用电源电路输出的电量信号,调节微控制器、温湿度传感器、细颗粒物浓度传感器、二氧化碳浓度传感器四类应用设备之间的实时连接关系,完成空气质量在线监测的硬件终端平台设计;借助NB-IoT密钥文本,计算空口协议栈表达式,实现对监测系统安全运行机制的完善;分别从main函数、数据信息采集函数、监测任务函数3个角度着手,求解监测系统运行过程中的主要应用函数,并根据具体计算数值,调节各级硬件设备之间的连接关系,完成基于NB-IoT的室外环境空气质量在线监测系统设计;实验结果表明,NB-IoT机制作用下,在线监测系统在不同温度、湿度条件下,均可以将二氧化碳气体实测浓度与真实浓度之间的差值控制在3 ppm以内,与远距离多通道型监测系统相比,更符合室外环境空气质量监测的实际应用需求。In order to accurately measure the concentration level of polluting gas in outdoor environment and realize the accurate monitoring of outdoor air quality,an online monitoring system of the outdoor air quality based on narrow band internet of things(NB-IoT)is designed.Using the power signal output by the power supply circuit,adjust the real-time connection relationships of the microcontroller,temperature and humidity sensor,fine particle concentration sensor,carbon dioxide concentration sensor,and complete the hardware terminal platform design for the online air quality monitoring.With the help of the NB-IoT key text,the air interface protocol stack expression is calculated to improve the security operation mechanism of the monitoring system.Starting from the main function,data information collection function,and monitoring task function,the main application functions in the operation process of the monitoring system are solved,and the connection relationship between the hardware devices at all levels are adjusted through the specific calculation values.The NB-IoT online monitoring system is designed for outdoor ambient air quality.The experimental results show that under the action of the NB-IoT mechanism,the online monitoring system can control the difference between the measured concentration of carbon dioxide gas and real concentration within 3ppm under the different temperature and humidity conditions,compared with the long-distance multi-channel monitoring system,the system meets the practical application requirements of outdoor ambient air quality monitoring.

关 键 词：NB-IoT密钥 室外环境 空气质量监测 浓度传感器 空口协议栈 

分 类 号：TP873[自动化与计算机技术—检测技术与自动化装置]