面向物联网应用的水体盐度监测系统设计  

Design of Water Salinity Monitoring System for Internet of Things Applications

作　　者：邓潇阳 徐志宇[1,2] DENG Xiaoyang;XU Zhiyu(School of Electronics&Informatics,Tongji University,Shanghai 201804,China;National Computer and Information Technology Practical Education Demonstration Center,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学电子与信息工程学院,上海201804 [2]同济大学计算机与信息技术国家级试验教学示范中心,上海201804

出　　处：《自动化仪表》2021年第5期19-21,26,共4页Process Automation Instrumentation

基　　金：国家级计算机与信息技术试验教学示范中心建设基金资助项目(教高函[2018]79);同济大学试验教改基金资助项目(同济资[2020]5)。

摘　　要：近年来,随着我国经济水平的不断提升与物质水平的进一步提高,市场对于海水鱼的需求量与日俱增,而盐度是海水鱼养殖的关键技术指标。为提高海水鱼养殖水平,采用物联网架构,设计了一种用于海水鱼养殖的使用电容式传感器的水体盐度实时监测的系统。不同盐度水体介电常数不同,因此基于变介电常数型电容传感器的原理,设计了固定间距的电极板探头;采用FDC2214模块进行电容测量,并通过试验标定了电容-盐浓度曲线;利用该曲线,通过树莓派将测量得到的电容值转化为实际的水体盐浓度。以上设备共同组成智能终端。智能终端将测得的数据上传云平台OneNET,通过OneNET平台存储浓度数据流,绘制实时的水体盐度折线图,并设置了两个触发器。触发器将在浓度值超出阈值范围时自动发出警告。整个系统实现了实时水体盐度值监测、移动端实时数据的访问以及自动告警功能,满足实际的海水鱼人工养殖需要。In recent years,with the continuous improvement of China's economic level and material level,the market demand for sea water fish is increasing rapidly,and salinity is the key technical index of sea water fish culture.In order to improve the level of mariculture,this design adopts the Internet of things architecture,and designs a real-time monitoring system of water salinity using capacitive sensor for mariculture.The dielectric constant of different salinity water is different,so this design based on the principle of variable dielectric constant capacitance sensor,designed the electrode plate probe with fixed spacing;used FDC2214 module to measure the capacitance,and calibrated the capacitance-salt concentration curve through experiments;using this curve,through Raspberry Pi,transformed the measured capacitance value into the actual water salt concentration.The above devices together constitute a smart terminal.The smart terminal uploads the measured data to OneNET platform,through which stores the concentration data flow,draws the real-time water salinity line chart,and sets two triggers.The trigger will automatically warn when the concentration value exceeds the threshold range.The whole system realizes the functions of real-time monitoring of water salinity,real-time data access on mobile terminal and automatic alarm,which can meet the actual needs of mariculture.

关 键 词：物联网 水体盐度监测 智能终端 电容式传感器 OneNET云平台 

分 类 号：TH89[机械工程—仪器科学与技术]