基于光纤传感的车辆动态称重检测系统的研制

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1、分类号UDCY85584t1密级——单位代码10151基于光纤传感的车辆动态称重检测系统的研制吴奇峰指导教师王莹职称副教授学位授予单位大连海事大学研究生院申请学位级别硕士学科与专业信号与信息处理论文完成日期2006．2论文答辩日期答辩委员会主席TheResearchofAVehicleWeight-in-MotionDetectingSystemBasedonOpticalFiberSensorAbstractWiththehigh—speeddevelopmentofthetraffic．over-loadingiscomingfrombadtoworse

2、．Over-loadingnotonlydestroystrafficinfrastructures，butalsocausestrafficaccidents。frequently．So，Weight—in—motion(、WIM)systemsinthetrafficsystemarebecomingmoreandmoreimportant!Inordertodetectthetraffics’weightinmotioninrealtime，sensorstOcapturethesignaloftrafficsshouldbedesignedfirst

3、．Atpresent，therearesomekindsofsensorsusedinWIMsystemsuchaspiezoelectricitysensor,capacitancesensor,bendplantsensorandSOon．Butinpracticethesesensorshavemanydisadvantagesbecauseofthebadconditionsintheinvestments．Forexample，theirmeasuringresultsshiftalongwiththechangesoftemperatureand

4、time．Theyhavelowelectromagnetismanti-jammingqualityandcomplicatedequipmentofinstruments，etc．／nrecentyears，DSPtechnologydevelopsatveryfastspeedandopticalfibersensortechnologyiswidelyusedincontrolandmeasurementdomain．Alloftheseprovidetechnicalconvinceforopticalfibersensor’Sapplicatio

5、ninWIM．Inthis】paper,anewWIMsystemI‘SproposedbasedonMach—Zehnderopticalfiberinterferometer．ComparingwiththetraditionalWIMsystemsmentionedabove，thissystemhashi：ghmeasuringprecision、goodelectromagnetismanti-jammingability、fasterresponsequalities．Furthermore，itiseasyforworkingonthenetw

6、orkconditions!hardwareof-thisWIMsystemismainlymadeupoffourparts：opticfibersensor、analogcircuit、digitalcircuitandthe．Thefirstpartconsistsoflamp—house、Mach—Zehnderinterferometer、PINdetector；thesecondpartconsistsoftheband-passfilter、amplifiercircuitofanalogsignal．Digitalcircuitisbased

7、onDSP,producedbyTexasInstrumentCorporation，usingComplexPmgranmmbleLogicDevice(CPLD)producedbyALTERALcompanytocontrolthecoding—schedulecircuitofthewholesystem．Theforthpartisusedforstoringthedata、makinggridsorfingers．Finally,thispaperoffersdetaileddiscussoneverypartofthesystemalongwi

8、th1ItrafficWIMtheory,andac