国家自然科学基金重大研究计划培育项目 (92052106); 国家自然科学基金(61771385); 陕西省杰出青年科学基金(2020JC-42); 固体激光技术重点实验室开放基金(6142404190301); 西安市高校人才服务企业工程(GXYD14.26)
为解决目前我国水质监测存在的监测站点少, 通信费用高, 功耗大等问题, 本文构建了基于LoRa无线传输技术的水质监测系统. 该系统由数据采集终端、无线通信电路和远程控制中心3部分组成, 应用嵌入式技术和FreeRTOS系统完成传感器任务调度和数据采集, 通过无线通信电路使用LoRa技术发送至远程控制中心并在上位机软件中进行显示. 上位机软件使用Qt实现, 可实时监测到传感器状态以及监测点的定位信息. 测试结果表明, pH等5种数据的变异系数小于5%, 温度也仅为8.76%, 表明可稳定持续在一段时间内监测灞河水质. 本系统具有成本低, 可扩展性强, 集成度高等优点, 可用于污水监测和水产养殖等水域环境, 具有良好的应用前景.
Currently, water quality monitoring in China is faced with many problems, such as limited monitoring points, heavy communication costs, and high power consumption. To solve these problems, this study constructs a water quality monitoring system based on the LoRa wireless transmission technology. This system is composed of a data acquisition terminal, a wireless communication circuit, and a remote-control center. The embedded technology and the FreeRTOS system are used for sensor task scheduling and data collection. The processed data are then sent to the remote-control center through a wireless communication circuit with the LoRa technology and finally displayed in the upper computer software, which, implemented in Qt, can monitor sensor status and location of monitoring points in real time. The test results show that the coefficients of variation of the five data including pH are less than 5% and that of temperature is as low as 8.76%, which means the water quality of the Bahe River can be monitored stably and continuously for a period of time. With the advantages of low cost, strong expansibility, and high integration, the proposed system has good application prospects in water environments of sewage monitoring and aquaculture.