基于无线传感器网络的温室CO_2浓度监控系统  

Monitoring System for CO_2 Concentration in Greenhouse Based on Wireless Sensor Network

作　　者：王嘉宁[1,2] 牛新涛 徐子明[1,2] 郑传涛[1,2] 王一丁[1,2] 

机构地区：[1]吉林大学电子科学与工程学院,长春130012 [2]集成光电子学国家重点联合实验室,长春130012

出　　处：《农业机械学报》2017年第7期280-285,367,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金："十二五"国家科技支撑计划项目(2014BAD08B03;2013BAK06B04);国家自然科学基金项目(61307124;11404129);吉林省科技发展计划项目(20120707;20140307014SF);长春市科技发展计划项目(11GH01;14KG022);集成光电子学国家重点实验室开放课题项目(IOSKL2012ZZ12)

摘　　要：设计了一种温室二氧化碳(CO_2)浓度监控系统,该系统由传感器节点、CO_2浓度调控节点、无线通信网络和上位机软件平台构成。采用红外CO_2测量模块S300作为传感器节点的核心模块对温室CO_2浓度进行实时测量,并将采集到的CO_2浓度、温湿度、光照等环境信息通过无线网络传输至上位机软件平台,实现了对温室环境的远程监控。上位机软件平台对采集到的环境参数进行处理、信息网络同步,并通过模糊PID算法对温室内CO_2浓度进行智能调节。在通信过程中,传感器节点实时采集接收信号强度(RSSI),在保证数据传输质量的同时有效调整无线发射功率以延长节点寿命。在实验室条件下配备了标准浓度的CO_2气体样品对设计的传感器节点性能进行了标定和表征,结果显示,该传感器对CO_2体积分数的检测下限小于5×10^(-5);对体积分数为3×10^(-4)和6.5×10^(-4)的CO_2气体样品分别进行了10 h的长期测量,相对波动小于2.6%。将该监测系统在吉林省长春市双阳区奢岭镇国信采摘园进行了现场调控试验,试验温室面积为640 m^2,设定温室中CO_2的目标体积分数为8×10^(-4),经调控后温室中CO_2体积分数的波动范围约为(8±0.42)×10^(-4)。该CO_2监测系统具有小型化、高性价比、高测量精度等优势,实现了信息的智能化管理与远程同步,以及温室内CO_2浓度的智能调控。A CO2 concentration monitoring system targeting greenhouse application was designed,which included sensor nodes,CO2 concentration regulation node,wireless communication and PC terminals.A remote real-time CO2 concentration measurement was realized by using an infrared CO2 model S300 as the core model in sensor node. Environmental information derived by sensor nodes was transmitted to the PC software panel based on Lab VIEW through wireless sensor networks. Received signal strength indication（ RSSI） was sampled in transmission to ensure link quality and extend the service lives of sensor nodes by reasonably adjusting the transmission power. The designed and fabricated sensor node was calibrated and characterized by the standard CO2 samples distributed under laboratory conditions.The experiment results indicated that the limitation of detection of the selected sensor was lower than 5 ×10^-5. The fluctuations for the long-term stability measurements on a 3 × 10^-4CO2 sample and a 6. 5 ×10^-4CO2 sample were less than 2. 6%. This designed monitoring system was deployed in the Guoxin picking garden in the town of Sheling,Shuangyang District,Changchun City,Jilin Province,and the field experiment was carried out in a solar greenhouse whose area was 640 m^2. The desired CO2 concentration in greenhouse was set to 8 × 10^-4,the fluctuation range under controlled CO2 concentrationwas nearly（ 8 ± 0. 42） × 10^-4. The designed sensor node had advantages,including miniaturization,cost-effective and high precision, which realized intelligent management, remote synchronization of greenhouse factors and smart regulation of CO2 concentration in greenhouse.

关 键 词：温室 CO2浓度传感器 无线通信网络 监控系统 

分 类 号：S625.51[农业科学—园艺学]