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1、AbstractToovercometheshortcomingsoftraditionalmonitoringmethodsofwater-dissolvedoxygen,combiningthefluorescencequenchingdetectionandtheGPRS(GeneralPacketRadioService)remotetransmissiontechnology,aremotemonitorsystemforwater-dissolvedoxygenhasbeenstudiedinthi
2、spaper.Also,thedesignprocess,networkingmethodofRTU(RemoteTerminalUnit),andthedesignmethodofcentralserverhavebeendemonstrated.BuildingtheGPRSwirelessnetworkbetweenmonitoringpointsandmonitoringcenterrelyingontheGPRSnetwork,theterrainlimitationcouldbebrokenandd
3、atatransmissionbetweenterminalunitsandmonitorcenterisaccomplished・Thus,functionssuchasrealtimedatacollection,remotedatatransmissionandmonitoring,andsooncouldbeimplemented.Firstofall,theworkingprinciplesofthesystem,includingtheprincipleofDOmeasurement,GPRStra
4、nsmissionandvirtualinstrumentmonitoring,havebeenintroducedinthepaper.Secondly,thedesignflowandimplementationprocessesofbothhardwareandsoftwareofRTUhavebeenpresented.ThehardwarecomponentsofRTUincludetheterminalcontroller,thedataacquisitionmodule,theGPRStransm
5、issionmodule.Aswell,thesoftwaredesignisaimedtoguaranteethenormalworkofRTU.Themonitorcenteriscomposedofthenetworkcommunicationmodule,thedatabasemanagementmoduleandthedataprocessingmodule,etc.Bydenoisingandanalyzingthecollectedfluorescencesignals,usefulsignals
6、couldbeobtainedandmeasuringresultscouldbedisplayeddirectly.Finally,thefeasibilityofthedesignedsystemhasbeenverifiedbyexperiments.KeywordsRemotemonitorsystem;Fluorescencequenchingdetection;GPRSremotetransmission;Water-dissolvedoxygen;Virtualinstrument摘要IAbstr
7、actII第1章绪论11.1引言11.2国内外研究现状2121国外研究现状21.2.2国内研究现状31.3溶解氧浓度主要测量方法41.3」碘量法41.3.2电化学法51.3.4荧光淬灭法61.4溶解氧浓度测量的展望71.5本论文的研究目的和主要内容7151本论文的研究冃的71.5.2木论文的主要内容8第2章系统的测量原理92.1溶解氧传感器测量原理92.1.1相移法测荧光寿命102.1.2锁相放大技术102.2GPRS传输原理122.2.1GPRS系统的网络结构122.2.2GPRS数据传输和信令协议平台142
8、.2.3分组路由和传递152.2.4控制指令162.3远程监控原理16231网络通信模式172.3.2网络协议172.4本章小结18第3章监测系统的结构193.1系统设计冃标及功能193.2系统总体结构193.3远程终端（RTU）203.3.1数据采集模块213.3.2终端控制模块213.3.3GPRS模块22334输出控制模块22233相关外围设备223.4GPRS传输网络223.5
